diff --git a/backend/src/index.js b/backend/src/index.js
index edfa8472..48c0588d 100644
--- a/backend/src/index.js
+++ b/backend/src/index.js
@@ -52,6 +52,7 @@ import { DEPRECATION_REGISTRY } from './deprecations.js';
 import { generateAllowlist } from './lib/allowlist/merkle.js';
 import { parseAllowlistCsv, validateGAddress, MAX_ALLOWLIST_ROWS } from './lib/allowlist/csv.js';
 import { createEmbedRoute } from './routes/embed.js';
+import { createTemplateRoutes } from './routes/templates.js';
 import { createSseRoutes } from './routes/sse.js';
 import { createEmbedWidgetRoute } from './routes/embedWidget.js';
 import { createDevPortalRoutes } from './routes/devPortal.js';
@@ -1999,6 +2000,9 @@ export async function createApp(options = {}) {
       },
     );
 
+    // Campaign templates (#810)
+    app.use(`${prefix}/templates`, rateLimiter, createTemplateRoutes());
+
     app.post(`${prefix}/admin/api-keys`, rateLimiter, idempotencyMiddleware, requireMasterKey, createApiKeyHandler);
     app.get(`${prefix}/admin/api-keys`, rateLimiter, requireMasterKey, listApiKeysHandler);
     app.delete(`${prefix}/admin/api-keys/:id`, rateLimiter, requireMasterKey, revokeApiKeyHandler);
diff --git a/backend/src/routes/templates.js b/backend/src/routes/templates.js
new file mode 100644
index 00000000..49bc969a
--- /dev/null
+++ b/backend/src/routes/templates.js
@@ -0,0 +1,55 @@
+/**
+ * Campaign templates route — /api/templates
+ *
+ * GET  /api/templates          — List all template summaries
+ * GET  /api/templates/:id      — Get a single template with full config
+ * POST /api/templates/:id/clone — Clone a template into a campaign config
+ * POST /api/templates/save      — Save an existing campaign as a template
+ */
+
+import { Router } from 'express';
+import {
+  getTemplateCatalog,
+  getTemplateById,
+  cloneTemplate,
+  saveAsTemplate,
+} from '../services/campaignTemplates.js';
+
+export function createTemplateRoutes() {
+  const router = Router();
+
+  // List all templates
+  router.get('/', (_req, res) => {
+    res.json({ templates: getTemplateCatalog() });
+  });
+
+  // Get single template
+  router.get('/:id', (req, res) => {
+    const template = getTemplateById(req.params.id);
+    if (!template) {
+      return res.status(404).json({ error: 'Template not found' });
+    }
+    res.json({ template });
+  });
+
+  // Clone a template
+  router.post('/:id/clone', (req, res) => {
+    const result = cloneTemplate(req.params.id, req.body);
+    if (!result.valid) {
+      return res.status(400).json({ errors: result.errors });
+    }
+    res.json({ config: result.config });
+  });
+
+  // Save campaign as template
+  router.post('/save', (req, res) => {
+    const { campaign } = req.body;
+    if (!campaign) {
+      return res.status(400).json({ error: 'Campaign object is required' });
+    }
+    const template = saveAsTemplate(campaign);
+    res.status(201).json({ template });
+  });
+
+  return router;
+}
diff --git a/backend/src/services/campaignTemplates.js b/backend/src/services/campaignTemplates.js
new file mode 100644
index 00000000..269ad2ab
--- /dev/null
+++ b/backend/src/services/campaignTemplates.js
@@ -0,0 +1,219 @@
+/**
+ * Campaign templates service
+ * Provides curated templates for common campaign patterns.
+ */
+
+const TEMPLATES = [
+  {
+    id: 'referral-basic',
+    name: 'Basic Referral',
+    description: 'Reward users for referring friends. Simple two-tier structure.',
+    category: 'referral',
+    icon: '🔗',
+    config: {
+      type: 'referral',
+      rewardPerReferral: 100,
+      maxReferrals: 50,
+      tiers: [
+        { name: 'Bronze', minReferrals: 0, bonusPercent: 0 },
+        { name: 'Silver', minReferrals: 10, bonusPercent: 10 },
+        { name: 'Gold', minReferrals: 25, bonusPercent: 25 },
+      ],
+      windowDays: 30,
+      rules: {
+        requireVerification: true,
+        minAccountAge: 7,
+      },
+    },
+  },
+  {
+    id: 'leaderboard-weekly',
+    name: 'Weekly Leaderboard',
+    description: 'Points-based leaderboard with weekly resets and tiered rewards.',
+    category: 'leaderboard',
+    icon: '🏆',
+    config: {
+      type: 'leaderboard',
+      scoringMethod: 'points',
+      resetPeriod: 'weekly',
+      tiers: [
+        { name: 'Top 3', rankStart: 1, rankEnd: 3, rewardPercent: 50 },
+        { name: 'Top 10', rankStart: 4, rankEnd: 10, rewardPercent: 30 },
+        { name: 'Top 25', rankStart: 11, rankEnd: 25, rewardPercent: 20 },
+      ],
+      windowDays: 7,
+      rules: {
+        minActivity: 1,
+        antiSybil: true,
+      },
+    },
+  },
+  {
+    id: 'tiered-rewards',
+    name: 'Tiered Rewards',
+    description: 'Escalating rewards based on cumulative engagement milestones.',
+    category: 'engagement',
+    icon: '🎯',
+    config: {
+      type: 'milestone',
+      milestones: [
+        { name: 'Starter', threshold: 1, reward: 10 },
+        { name: 'Active', threshold: 10, reward: 50 },
+        { name: 'Power User', threshold: 50, reward: 200 },
+        { name: 'Champion', threshold: 100, reward: 500 },
+      ],
+      windowDays: 90,
+      rules: {
+        trackCumulative: true,
+        allowRetroactive: false,
+      },
+    },
+  },
+  {
+    id: 'airdrop-registration',
+    name: 'Registration Airdrop',
+    description: 'Reward early registrants with a fixed token airdrop.',
+    category: 'airdrop',
+    icon: '🎁',
+    config: {
+      type: 'airdrop',
+      rewardPerParticipant: 50,
+      maxParticipants: 1000,
+      windowDays: 14,
+      rules: {
+        requireVerification: true,
+        firstComeFirstServed: true,
+      },
+    },
+  },
+  {
+    id: 'community-engagement',
+    name: 'Community Engagement',
+    description: 'Multi-action campaign rewarding diverse engagement activities.',
+    category: 'engagement',
+    icon: '💬',
+    config: {
+      type: 'multi-action',
+      actions: [
+        { name: 'Register', points: 10, oneTime: true },
+        { name: 'Daily Check-in', points: 5, oneTime: false },
+        { name: 'Refer a Friend', points: 25, oneTime: false },
+        { name: 'Complete Profile', points: 15, oneTime: true },
+      ],
+      windowDays: 30,
+      rules: {
+        maxDailyPoints: 50,
+        antiSybil: true,
+      },
+    },
+  },
+];
+
+/**
+ * Get all available templates.
+ * @returns {Array} List of template summaries (without full config).
+ */
+export function getTemplateCatalog() {
+  return TEMPLATES.map(({ id, name, description, category, icon }) => ({
+    id,
+    name,
+    description,
+    category,
+    icon,
+  }));
+}
+
+/**
+ * Get a single template by ID.
+ * @param {string} templateId
+ * @returns {object|null} Full template including config.
+ */
+export function getTemplateById(templateId) {
+  return TEMPLATES.find((t) => t.id === templateId) ?? null;
+}
+
+/**
+ * Clone a template into a campaign-ready config.
+ * Applies overrides and validates the result.
+ * @param {string} templateId
+ * @param {object} overrides - User-provided overrides (name, dates, etc.)
+ * @returns {{ valid: boolean, config?: object, errors?: string[] }}
+ */
+export function cloneTemplate(templateId, overrides = {}) {
+  const template = getTemplateById(templateId);
+  if (!template) {
+    return { valid: false, errors: [`Template "${templateId}" not found`] };
+  }
+
+  const config = {
+    ...structuredClone(template.config),
+    name: overrides.name ?? template.name,
+    description: overrides.description ?? template.description,
+    startDate: overrides.startDate ?? null,
+    endDate: overrides.endDate ?? null,
+    ...overrides,
+  };
+
+  const errors = validateClonedConfig(config);
+  if (errors.length > 0) {
+    return { valid: false, errors };
+  }
+
+  return { valid: true, config };
+}
+
+/**
+ * Save an existing campaign as a reusable template.
+ * @param {object} campaign - The campaign to save as template.
+ * @returns {object} A template object.
+ */
+export function saveAsTemplate(campaign) {
+  return {
+    id: `custom-${Date.now()}`,
+    name: campaign.name ?? 'Custom Template',
+    description: campaign.description ?? '',
+    category: 'custom',
+    icon: '⭐',
+    config: {
+      type: campaign.type ?? 'referral',
+      ...campaign.config,
+    },
+  };
+}
+
+/**
+ * Validate a cloned config before publish.
+ * @param {object} config
+ * @returns {string[]} List of validation errors (empty if valid).
+ */
+function validateClonedConfig(config) {
+  const errors = [];
+
+  if (!config.name || typeof config.name !== 'string') {
+    errors.push('Campaign name is required');
+  }
+
+  if (config.startDate && config.endDate) {
+    const start = new Date(config.startDate);
+    const end = new Date(config.endDate);
+    if (isNaN(start.getTime()) || isNaN(end.getTime())) {
+      errors.push('Invalid date format');
+    } else if (end <= start) {
+      errors.push('End date must be after start date');
+    }
+  }
+
+  if (config.windowDays !== undefined) {
+    if (typeof config.windowDays !== 'number' || config.windowDays <= 0) {
+      errors.push('windowDays must be a positive number');
+    }
+  }
+
+  if (config.maxParticipants !== undefined) {
+    if (typeof config.maxParticipants !== 'number' || config.maxParticipants <= 0) {
+      errors.push('maxParticipants must be a positive number');
+    }
+  }
+
+  return errors;
+}