diff --git a/app/controllers/events_controller.rb b/app/controllers/events_controller.rb
index 3060ccf97..cf1a0e811 100644
--- a/app/controllers/events_controller.rb
+++ b/app/controllers/events_controller.rb
@@ -237,7 +237,7 @@ def event_params
                                   :timezone, :content_provider_id, { collection_ids: [] }, { node_ids: [] },
                                   { node_names: [] }, { target_audience: [] }, { eligibility: [] }, :visible,
                                   { host_institutions: [] }, :capacity, :contact, :recognition, :learning_objectives,
-                                  :prerequisites, :tech_requirements, :cost_basis, :cost_value, :cost_currency, :language,
+                                  :prerequisites, :tech_requirements, :cost_basis, :cost_value, :cost_currency, :language, :presence,
                                   external_resources_attributes: %i[id url title _destroy],
                                   external_resources: %i[url title], material_ids: [],
                                   llm_interaction_attributes: %i[id scrape_or_process model prompt input output needs_processing _destroy],
diff --git a/config/secrets.example.yml b/config/secrets.example.yml
index 51f0fa8f1..d2161c560 100644
--- a/config/secrets.example.yml
+++ b/config/secrets.example.yml
@@ -38,6 +38,7 @@ external_api_keys: &external_api_keys
     password:
   gpt_api_key:
   willma_api_key:
+  indico_api_token:   # begins by 'indp_', cf. https://docs.getindico.io/en/stable/http-api/access/#api-token-authentication
   orcid:
     client_id:
     secret:
diff --git a/lib/ingestors/concerns/sitemap_helpers.rb b/lib/ingestors/concerns/sitemap_helpers.rb
new file mode 100644
index 000000000..2f27a82f7
--- /dev/null
+++ b/lib/ingestors/concerns/sitemap_helpers.rb
@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+module Ingestors
+  module Concerns
+    # From a sitemap.{xml|txt} or a single URL, get the list of URLs (= sources)
+    module SitemapHelpers
+      private
+
+      # Reads either a sitemap.{xml|txt} or a single URL
+      # Returns a list of URLs from 1 to n URLs
+      def parse_sitemap(source_url)
+        case source_url.downcase
+        when /sitemap(.*)?\.xml\Z/
+          parse_xml_sitemap(source_url)
+        when /sitemap(.*)?\.txt\Z/
+          parse_txt_sitemap(source_url)
+        else
+          [source_url]
+        end
+      end
+
+      def parse_xml_sitemap(url)
+        urls = SitemapParser.new(
+          url,
+          recurse: true,
+          headers: { 'User-Agent' => config[:user_agent] }
+        ).to_a.uniq.map(&:strip)
+
+        log_sitemap('xml', url, urls.count)
+        urls
+      rescue StandardError => e
+        @messages << "Extract from sitemap[#{url}] failed with: #{e.message}"
+        nil
+      end
+
+      def parse_txt_sitemap(url)
+        urls = open_url(url).to_a.uniq.map(&:strip)
+
+        log_sitemap('txt', url, urls.count)
+        urls
+      end
+
+      def log_sitemap(ext, url, count)
+        @messages << "Parsing .#{ext} sitemap: #{url}\n - #{count} URLs found"
+      end
+    end
+  end
+end
diff --git a/lib/ingestors/indico_ingestor.rb b/lib/ingestors/indico_ingestor.rb
new file mode 100644
index 000000000..475eb595a
--- /dev/null
+++ b/lib/ingestors/indico_ingestor.rb
@@ -0,0 +1,141 @@
+# frozen_string_literal: true
+
+require 'icalendar'
+require 'nokogiri'
+require 'open-uri'
+require 'tzinfo'
+
+module Ingestors
+  # Reads from direct .ics or Indico (event or category) URLs, .xml sitemaps, and .txt sitemaps.
+  class IndicoIngestor < Ingestor
+    include Ingestors::Concerns::SitemapHelpers
+
+    def self.config
+      {
+        key: 'indico',
+        title: 'Indico / .ics file',
+        category: :events
+      }
+    end
+
+    def read(source_url)
+      @token = Rails.application.config.secrets.indico_api_token
+      @verbose = false
+      sources = parse_sitemap(source_url)
+      return if sources.nil?
+
+      sources.each do |url|
+        process_url(url)
+      end
+    end
+
+    private
+
+    # Modifies the given URL to the ics export.
+    # Loops into each event to process it.
+    # Note: One .ics file can have multiple events.
+    def process_url(url)
+      export_url = to_export(url)
+      raise 'Not an indico link' if export_url.nil?
+
+      content = open_url(export_url, raise: true, token: @token).set_encoding('utf-8')
+      events = Icalendar::Event.parse(content)
+      raise 'Not found' if events.nil? || events.empty?
+
+      events.each do |e|
+        process_calevent(e)
+      end
+    rescue StandardError => e
+      @messages << "Process file url[#{export_url}] failed with: #{e.message}"
+    end
+
+    # 1. If the path already ends with '/events.ics', return as-is.
+    # 2. If the host includes 'indico', ensures the path ends with '/events.ics'.
+    # This method never mutates the original URL string.
+    # Returns the updated URL string or nil if input is blank.
+    def to_export(url)
+      return nil if url.blank?
+
+      uri = URI.parse(url)
+      path = uri.path.to_s
+
+      if path.match?(%r{/(event|events)\.ics\z})
+        uri.to_s
+      elsif indico_page?(uri)
+        ensure_events_ics_path(uri)
+      end
+    end
+
+    def indico_page?(uri)
+      # Either checks in host, e.g., 'indico.myinstitution.com'
+      return true if uri.host&.include?('indico')
+
+      # Or checks in meta tags
+      html = open_url(uri, raise: true)
+      doc = Nokogiri::HTML(html)
+      content = doc.at('meta[property="og:site_name"]')&.[]('content')
+      content&.match?(/indico/i)
+    end
+
+    # Ensures the Indico URL ends with '/events.ics'
+    def ensure_events_ics_path(uri)
+      paths = uri.path.split('/')
+      uri.path = "#{paths[0..2].join('/')}/"
+      if paths[1] == 'event'
+        uri.path = File.join(uri.path, 'event.ics')
+      elsif paths[1] == 'category'
+        uri.path = File.join(uri.path, 'events.ics')
+      end
+      uri.to_s
+    end
+
+    # Builds the OpenStruct event and adds it in event.
+    def process_calevent(calevent)
+      event_to_add = OpenStruct.new.tap do |event|
+        assign_basic_info(event, calevent)
+        assign_time_info(event, calevent)
+        assign_location_info(event, calevent)
+      end
+      add_event(event_to_add)
+    rescue StandardError => e
+      Rails.logger.error("#{e.class}: #{e.message}")
+    end
+
+    # Assigns to event: url, title, description, keywords.
+    def assign_basic_info(event, calevent)
+      event.url = calevent.url.to_s
+      event.title = calevent.summary.to_s
+      event.description = calevent.description.to_s
+      event.keywords = calevent.categories.flatten
+      event.contact = calevent.contact.join(', ')
+    end
+
+    # Assigns to event: start, end, timezone.
+    def assign_time_info(event, calevent)
+      event.start = calevent.dtstart&.to_time unless calevent.dtstart.nil?
+      event.end = calevent.dtend&.to_time unless calevent.dtend.nil?
+      event.timezone = get_tzid(calevent.dtstart)
+    end
+
+    # Assigns to event: venue, online, city.
+    def assign_location_info(event, calevent)
+      location = calevent.location
+      return if location.blank?
+
+      event.venue = location.to_s
+      event.online = calevent.description.include?('zoom')
+      event.presence = calevent.description.include?('zoom') ? :hybrid : :onsite # can do best, but sufficient for now
+    end
+
+    # Extracts the timezone identifier (TZID) from an iCalendar event's dtstart field.
+    # Handles whether tzid shows up as an Array or a single string
+    def get_tzid(dtstart)
+      return nil unless dtstart.respond_to?(:ical_params)
+
+      tzid = dtstart.ical_params['tzid']
+      return nil if tzid.nil?
+
+      tzid.is_a?(Array) ? tzid.first.to_s : tzid.to_s
+    end
+  end
+end
diff --git a/lib/ingestors/ingestor.rb b/lib/ingestors/ingestor.rb
index 8f043f135..a662985cf 100644
--- a/lib/ingestors/ingestor.rb
+++ b/lib/ingestors/ingestor.rb
@@ -50,13 +50,14 @@ def stats_summary(type)
       summary
     end
 
-    def open_url(url, raise: false)
+    def open_url(url, raise: false, token: nil)
       options = {
         redirect: false, # We're doing redirects manually below, since open-uri can't handle http -> https redirection
         read_timeout: 5
       }
       options[:ssl_verify_mode] = config[:ssl_verify_mode] if config.key?(:ssl_verify_mode)
       redirect_attempts = 5
+      options['Authorization'] = "Bearer #{token}" unless token.nil?
       begin
         URI(url).open(options)
       rescue OpenURI::HTTPRedirect => e
diff --git a/lib/ingestors/ingestor_factory.rb b/lib/ingestors/ingestor_factory.rb
index fe1a7bd3a..1da61a790 100644
--- a/lib/ingestors/ingestor_factory.rb
+++ b/lib/ingestors/ingestor_factory.rb
@@ -6,6 +6,7 @@ def self.ingestors
         Ingestors::EventbriteIngestor,
         Ingestors::EventCsvIngestor,
         Ingestors::IcalIngestor,
+        Ingestors::IndicoIngestor,
         Ingestors::LibcalIngestor,
         Ingestors::MaterialCsvIngestor,
         Ingestors::TessEventIngestor,
diff --git a/test/fixtures/files/ingestion/indico/event.ics b/test/fixtures/files/ingestion/indico/event.ics
new file mode 100644
index 000000000..58728eadf
--- /dev/null
+++ b/test/fixtures/files/ingestion/indico/event.ics
@@ -0,0 +1,16 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//CERN//INDICO//EN
+BEGIN:VEVENT
+SUMMARY:14th HEP C++ Course and Hands-on Training - The Essentials
+DTSTART:20260309T080000Z
+DTEND:20260313T161500Z
+DTSTAMP:20251204T105300Z
+UID:indico-event-1617123@indico.cern.ch
+CONTACT:name.surname@test.com
+DESCRIPTION:speakers and zoom here
+LOCATION:CERN
+URL:https://indico.cern.ch/event/1617123/
+CATEGORIES:TRAINING,EDUCATION
+END:VEVENT
+END:VCALENDAR
\ No newline at end of file
diff --git a/test/fixtures/files/ingestion/indico/events.ics b/test/fixtures/files/ingestion/indico/events.ics
new file mode 100644
index 000000000..7f3bbfd22
--- /dev/null
+++ b/test/fixtures/files/ingestion/indico/events.ics
@@ -0,0 +1,25 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//CERN//INDICO//EN
+BEGIN:VEVENT
+SUMMARY:14th HEP C++ Course and Hands-on Training - The Essentials
+DTSTART:20260309T080000Z
+DTEND:20260313T161500Z
+DTSTAMP:20251203T150800Z
+UID:indico-event-1617123@indico.cern.ch
+CONTACT:name.surname@test.com
+DESCRIPTION:speakers and zoom here
+LOCATION:CERN
+URL:https://indico.cern.ch/event/1617123/
+END:VEVENT
+BEGIN:VEVENT
+SUMMARY:HEP C++ Course and Hands-on Training - Stay Informed
+DTSTART:20991231T225800Z
+DTEND:20991231T225900Z
+DTSTAMP:20251203T150800Z
+UID:indico-event-1211412@indico.cern.ch
+CONTACT:name.surname@test.com
+DESCRIPTION:mockdescription
+URL:https://indico.cern.ch/event/1211412/
+END:VEVENT
+END:VCALENDAR
\ No newline at end of file
diff --git a/test/fixtures/files/ingestion/indico/indico.html b/test/fixtures/files/ingestion/indico/indico.html
new file mode 100644
index 000000000..33765bb38
--- /dev/null
+++ b/test/fixtures/files/ingestion/indico/indico.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+
+<html lang="en"
+      data-canonical-locale="en-US"
+      data-static-site="false">
+<head>
+    <title>My Agenda (Indico)</title>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <link rel="shortcut icon" type="image/x-icon" href="/images/indico.ico">
+
+    <meta property="og:site_name" content="Agenda (Indico)">
+    <meta property="og:image" content="https://agenda.com/images/indico_square.png">
+    
+</head>
+</html>
\ No newline at end of file
diff --git a/test/unit/ingestors/indico_ingestor_test.rb b/test/unit/ingestors/indico_ingestor_test.rb
new file mode 100644
index 000000000..7d9183df7
--- /dev/null
+++ b/test/unit/ingestors/indico_ingestor_test.rb
@@ -0,0 +1,118 @@
+require 'test_helper'
+
+class IndicoIngestorTest < ActiveSupport::TestCase
+  setup do
+    @ingestor = Ingestors::IndicoIngestor.new
+    @user = users(:regular_user)
+    @content_provider = content_providers(:another_portal_provider)
+    # mock_ingestions
+    # mock_timezone # System time zone should not affect test result
+
+    webmock('https://indico.cern.ch/event/1617123/', 'indico/indico.html')
+    webmock('https://indico.cern.ch/event/1617123/event.ics', 'indico/event.ics')
+    webmock('https://indico.cern.ch/category/11733/', 'indico/indico.html')
+    webmock('https://indico.cern.ch/category/11733/events.ics', 'indico/events.ics')
+    webmock('https://myagenda.com/event/1617123/', 'indico/indico.html')
+    webmock('https://myagenda.com/event/1617123/event.ics', 'indico/event.ics')
+  end
+
+  teardown do
+    reset_timezone
+  end
+
+  test 'should read indico link event' do
+    @ingestor.read('https://indico.cern.ch/event/1617123/')
+    @ingestor.write(@user, @content_provider)
+
+    sample = @ingestor.events.detect { |e| e.title == '14th HEP C++ Course and Hands-on Training - The Essentials' }
+    assert sample.persisted?
+
+    assert_equal sample.url, 'https://indico.cern.ch/event/1617123/'
+    assert_equal sample.title, '14th HEP C++ Course and Hands-on Training - The Essentials'
+    assert_equal sample.description, 'speakers and zoom here'
+    assert_equal sample.keywords, %w[TRAINING EDUCATION]
+    assert_equal sample.contact, 'name.surname@test.com'
+    assert_equal sample.start, '2026-03-09 08:00:00 +0000'
+    assert_equal sample.end, '2026-03-13 16:15:00 +0000'
+    assert_equal sample.timezone, 'UTC'
+    assert_equal sample.venue, 'CERN'
+    assert_match sample.presence, 'hybrid'
+  end
+
+  test 'should read indico link category' do
+    @ingestor.read('https://indico.cern.ch/category/11733/')
+    @ingestor.write(@user, @content_provider)
+
+    sample = @ingestor.events.detect { |e| e.title == '14th HEP C++ Course and Hands-on Training - The Essentials' }
+    sample2 = @ingestor.events.detect { |e| e.title == 'HEP C++ Course and Hands-on Training - Stay Informed' }
+    assert sample.persisted?
+    assert sample2.persisted?
+
+    assert_equal sample.url, 'https://indico.cern.ch/event/1617123/'
+    assert_equal sample2.url, 'https://indico.cern.ch/event/1211412/'
+  end
+
+  test 'should read non-indico link event' do
+    @ingestor.read('https://myagenda.com/event/1617123/')
+    @ingestor.write(@user, @content_provider)
+
+    sample = @ingestor.events.detect { |e| e.title == '14th HEP C++ Course and Hands-on Training - The Essentials' }
+    assert sample.persisted?
+
+    assert_equal sample.url, 'https://indico.cern.ch/event/1617123/'
+  end
+
+  test 'should convert url properly' do
+    indico_url_event = 'https://indico.cern.ch/event/1588342/'
+    indico_url_event_with_ics = 'https://indico.cern.ch/event/1588342/event.ics' # ! when '/event', event.ics is singular
+    indico_url_event_with_query = 'https://indico.cern.ch/event/1588342/?somerandom=urlparams&an=otherone'
+    indico_url_event_with_query_with_ics = 'https://indico.cern.ch/event/1588342/event.ics?somerandom=urlparams&an=otherone'
+    indico_url_category = 'https://indico.cern.ch/category/19377/'
+    indico_url_category_with_ics = 'https://indico.cern.ch/category/19377/events.ics' # ! when '/category', eventS.ics is plural
+    indico_url_category_with_query = 'https://indico.cern.ch/category/19377/?a=b&c=d'
+    indico_url_category_with_query_with_ics = 'https://indico.cern.ch/category/19377/events.ics?a=b&c=d'
+    url_with_ics = 'https://mywebsite.com/event/blabla/event.ics'
+    url_with_query_with_ics = 'https://mywebsite.com/event/blabla/event.ics?john=doe&isstub=born'
+
+    # When indico link – event
+    assert_equal @ingestor.send(:to_export, indico_url_event), indico_url_event_with_ics # adds event.ics
+    assert_equal @ingestor.send(:to_export, indico_url_event_with_query), indico_url_event_with_query_with_ics # adds event.ics
+
+    # When indico link – category
+    assert_equal @ingestor.send(:to_export, indico_url_category), indico_url_category_with_ics # adds events.ics (with an s)
+    assert_equal @ingestor.send(:to_export, indico_url_category_with_query), indico_url_category_with_query_with_ics # adds events.ics (with an s)
+
+    # When non-indico but ics link
+    assert_equal @ingestor.send(:to_export, url_with_ics), url_with_ics # keeps same
+    assert_equal @ingestor.send(:to_export, url_with_query_with_ics), url_with_query_with_ics # keeps same
+
+    # When indico link which already has the /events.ics
+    assert_equal @ingestor.send(:to_export, indico_url_event_with_ics), indico_url_event_with_ics # keeps it as-is
+    assert_equal @ingestor.send(:to_export, indico_url_event_with_query_with_ics), indico_url_event_with_query_with_ics # keeps it as-is
+  end
+
+  test 'should test std err' do
+    @ingestor.stub :open_url, ->(_url, *) { raise StandardError, 'test failure' } do
+      @ingestor.send(:process_url, 'https://indico.cern.ch/event/1617123/')
+
+      assert_equal 'Process file url[https://indico.cern.ch/event/1617123/event.ics] failed with: test failure', @ingestor.messages.first
+    end
+
+    @ingestor.stub(:assign_basic_info, ->(*) { raise StandardError, 'test failure' }) do
+      mock_logger = Minitest::Mock.new
+      mock_logger.expect(:error, nil, ['StandardError: test failure'])
+
+      Rails.stub(:logger, mock_logger) do
+        @ingestor.send(:process_calevent, Icalendar::Event.new)
+      end
+      mock_logger.verify
+    end
+  end
+
+  private
+
+  def webmock(url, filename)
+    file = Rails.root.join('test', 'fixtures', 'files', 'ingestion', filename)
+    WebMock.stub_request(:get, url).to_return(status: 200, headers: {}, body: file.read)
+  end
+end