diff --git a/src/pages/ethereum/execution/timings/components/GetBlobsTab/GetBlobsTab.tsx b/src/pages/ethereum/execution/timings/components/GetBlobsTab/GetBlobsTab.tsx
index 82bb01369..077d5713e 100644
--- a/src/pages/ethereum/execution/timings/components/GetBlobsTab/GetBlobsTab.tsx
+++ b/src/pages/ethereum/execution/timings/components/GetBlobsTab/GetBlobsTab.tsx
@@ -7,7 +7,7 @@ import { MultiLineChart } from '@/components/Charts/MultiLine';
 import { BarChart } from '@/components/Charts/Bar';
 import { LoadingContainer } from '@/components/Layout/LoadingContainer';
 import { useThemeColors } from '@/hooks/useThemeColors';
-import { formatSlot } from '@/utils';
+import { formatSlot, getExecutionClientColor } from '@/utils';
 import type { EngineTimingsData } from '../../hooks/useEngineTimingsData';
 import { PER_SLOT_CHART_RANGES, type TimeRange } from '../../IndexPage.types';
 import { ClientVersionBreakdown } from '../ClientVersionBreakdown';
@@ -249,16 +249,6 @@ export function GetBlobsTab({ data, timeRange, isLoading }: GetBlobsTabProps): J
     clientSlotData.get(client)!.set(slot, duration);
   });
 
-  // Create series for the by-client chart
-  const clientColors = [
-    themeColors.primary,
-    themeColors.success,
-    themeColors.warning,
-    themeColors.danger,
-    themeColors.accent,
-    themeColors.secondary,
-  ];
-
   // Downsample to ~400 points max per series to keep chart performant
   const MAX_POINTS_PER_SERIES = 400;
 
@@ -276,7 +266,7 @@ export function GetBlobsTab({ data, timeRange, isLoading }: GetBlobsTabProps): J
     return {
       name: client,
       data: sampledSlots.map(([slot, duration]) => [slot, duration]) as [number, number][],
-      color: clientColors[index % clientColors.length],
+      color: getExecutionClientColor(client, index),
     };
   });
 
@@ -350,7 +340,7 @@ export function GetBlobsTab({ data, timeRange, isLoading }: GetBlobsTabProps): J
     return {
       name: client,
       data: dataPoints,
-      color: clientColors[index % clientColors.length],
+      color: getExecutionClientColor(client, index),
     };
   });
 
@@ -369,7 +359,7 @@ export function GetBlobsTab({ data, timeRange, isLoading }: GetBlobsTabProps): J
     return {
       name: client,
       data: dataPoints,
-      color: clientColors[index % clientColors.length],
+      color: getExecutionClientColor(client, index),
     };
   });
 
@@ -423,7 +413,7 @@ export function GetBlobsTab({ data, timeRange, isLoading }: GetBlobsTabProps): J
     return {
       name: client,
       data: dataPoints,
-      color: clientColors[index % clientColors.length],
+      color: getExecutionClientColor(client, index),
     };
   });
 
diff --git a/src/pages/ethereum/execution/timings/components/NewPayloadTab/NewPayloadTab.tsx b/src/pages/ethereum/execution/timings/components/NewPayloadTab/NewPayloadTab.tsx
index 68ce96516..42ce7b813 100644
--- a/src/pages/ethereum/execution/timings/components/NewPayloadTab/NewPayloadTab.tsx
+++ b/src/pages/ethereum/execution/timings/components/NewPayloadTab/NewPayloadTab.tsx
@@ -7,7 +7,7 @@ import { MultiLineChart } from '@/components/Charts/MultiLine';
 import { BarChart } from '@/components/Charts/Bar';
 import { ScatterAndLineChart } from '@/components/Charts/ScatterAndLine';
 import { useThemeColors } from '@/hooks/useThemeColors';
-import { formatSlot } from '@/utils';
+import { formatSlot, getExecutionClientColor } from '@/utils';
 import type { EngineTimingsData } from '../../hooks/useEngineTimingsData';
 import { PER_SLOT_CHART_RANGES, type TimeRange } from '../../IndexPage.types';
 import { ClientVersionBreakdown } from '../ClientVersionBreakdown';
@@ -158,16 +158,6 @@ export function NewPayloadTab({ data, timeRange }: NewPayloadTabProps): JSX.Elem
 
   const hasBlockComplexityData = clientGasData.size > 0;
 
-  // Shared color palette for client charts
-  const clientColors = [
-    themeColors.primary,
-    themeColors.success,
-    themeColors.warning,
-    themeColors.danger,
-    themeColors.accent,
-    themeColors.secondary,
-  ];
-
   // === EL Client Analysis ===
   // Build a map of EL client -> metrics (VALID status only)
   const elClientMetrics = new Map<
@@ -240,7 +230,7 @@ export function NewPayloadTab({ data, timeRange }: NewPayloadTabProps): JSX.Elem
     return {
       name: client,
       data: sampledSlots.map(([slot, duration]) => [slot, duration] as [number, number]),
-      color: clientColors[index % clientColors.length],
+      color: getExecutionClientColor(client, index),
     };
   });
 
@@ -314,7 +304,7 @@ export function NewPayloadTab({ data, timeRange }: NewPayloadTabProps): JSX.Elem
     return {
       name: client,
       data: dataPoints,
-      color: clientColors[index % clientColors.length],
+      color: getExecutionClientColor(client, index),
     };
   });
 
@@ -333,7 +323,7 @@ export function NewPayloadTab({ data, timeRange }: NewPayloadTabProps): JSX.Elem
     return {
       name: client,
       data: dataPoints,
-      color: clientColors[index % clientColors.length],
+      color: getExecutionClientColor(client, index),
     };
   });
 
@@ -386,7 +376,7 @@ export function NewPayloadTab({ data, timeRange }: NewPayloadTabProps): JSX.Elem
     return {
       name: client,
       data: dataPoints,
-      color: clientColors[index % clientColors.length],
+      color: getExecutionClientColor(client, index),
     };
   });
 
@@ -394,7 +384,7 @@ export function NewPayloadTab({ data, timeRange }: NewPayloadTabProps): JSX.Elem
   const blockComplexitySeries = elClientList.map((client, index) => ({
     name: client,
     data: clientGasData.get(client) ?? [],
-    color: clientColors[index % clientColors.length],
+    color: getExecutionClientColor(client, index),
     symbolSize: 6,
   }));
 
diff --git a/src/utils/ethereum.ts b/src/utils/ethereum.ts
index 0dfe10277..4ea71a034 100644
--- a/src/utils/ethereum.ts
+++ b/src/utils/ethereum.ts
@@ -102,6 +102,49 @@ export function truncateAddress(pubkey?: string, startChars = 6, endChars = 4):
  */
 const EXECUTION_CLIENTS = ['geth', 'nethermind', 'besu', 'erigon', 'reth'] as const;
 
+/**
+ * Official brand colors for Ethereum execution clients
+ */
+export const EXECUTION_CLIENT_COLORS: Record<string, string> = {
+  besu: '#1ba0a1',
+  nethermind: '#02bbec',
+  reth: '#f44f02',
+  geth: '#707d91',
+  'go-ethereum': '#707d91',
+  erigon: '#f5ad73',
+};
+
+/**
+ * Default fallback colors for unknown clients
+ */
+const FALLBACK_COLORS = [
+  '#6b7280', // gray-500
+  '#8b5cf6', // violet-500
+  '#ec4899', // pink-500
+  '#14b8a6', // teal-500
+  '#f97316', // orange-500
+  '#84cc16', // lime-500
+];
+
+/**
+ * Get the brand color for an execution client
+ *
+ * @param clientName - Name of the execution client (case-insensitive)
+ * @param fallbackIndex - Index for fallback color if client is unknown (cycles through fallback colors)
+ * @returns Hex color string
+ *
+ * @example
+ * ```tsx
+ * getExecutionClientColor('nethermind') // Returns '#02bbec'
+ * getExecutionClientColor('Reth')       // Returns '#f44f02'
+ * getExecutionClientColor('unknown', 0) // Returns '#6b7280'
+ * ```
+ */
+export function getExecutionClientColor(clientName: string, fallbackIndex = 0): string {
+  const normalized = clientName.toLowerCase().trim();
+  return EXECUTION_CLIENT_COLORS[normalized] ?? FALLBACK_COLORS[fallbackIndex % FALLBACK_COLORS.length];
+}
+
 /**
  * Parse execution client name from meta client name
  * Extracts client name and version from strings like "Nethermind/v1.25.4"