diff --git a/components/InterestDuplicateNotificationBanner.vue b/components/InterestDuplicateNotificationBanner.vue
new file mode 100644
index 0000000..d7bfd86
--- /dev/null
+++ b/components/InterestDuplicateNotificationBanner.vue
@@ -0,0 +1,96 @@
+<template>
+  <v-alert
+    v-if="showBanner && duplicateCount > 0"
+    type="warning"
+    variant="tonal"
+    closable
+    @click:close="dismissBanner"
+    class="ma-4"
+  >
+    <template #prepend>
+      <v-icon>mdi-content-duplicate</v-icon>
+    </template>
+    
+    <div class="d-flex align-center justify-space-between">
+      <div>
+        <div class="text-subtitle-1 font-weight-medium">
+          {{ duplicateCount }} duplicate interest record{{ duplicateCount > 1 ? 's' : '' }} detected
+        </div>
+        <div class="text-body-2">
+          Duplicate interest records can affect data integrity and client communication.
+        </div>
+      </div>
+      
+      <v-btn
+        color="warning"
+        variant="elevated"
+        size="small"
+        :to="'/dashboard/admin/duplicates'"
+        prepend-icon="mdi-wrench"
+      >
+        Clean Up Duplicates
+      </v-btn>
+    </div>
+  </v-alert>
+</template>
+
+<script setup>
+const { hasRole } = useAuthorization();
+
+const showBanner = ref(true);
+const duplicateCount = ref(0);
+const loading = ref(false);
+
+// Check for duplicates on mount (sales/admin users)
+const checkForDuplicates = async () => {
+  if (loading.value) return;
+  
+  // Only check for users with sales or admin role
+  const canViewDuplicates = await hasRole(['sales', 'admin']);
+  if (!canViewDuplicates) return;
+  
+  try {
+    loading.value = true;
+    const response = await $fetch('/api/interests/duplicates/find', {
+      method: 'GET',
+      query: { 
+        threshold: 0.8,
+        dateRange: 365 // Check last year
+      }
+    });
+    
+    if (response.success && response.data?.duplicateGroups) {
+      duplicateCount.value = response.data.duplicateGroups.length;
+    }
+  } catch (error) {
+    console.error('[InterestDuplicateNotification] Failed to check for duplicates:', error);
+    // Silently fail - this is just a notification banner
+  } finally {
+    loading.value = false;
+  }
+};
+
+// Dismiss the banner for this session
+const dismissBanner = () => {
+  showBanner.value = false;
+  // Store dismissal in session storage
+  if (process.client) {
+    sessionStorage.setItem('interest-duplicates-banner-dismissed', 'true');
+  }
+};
+
+// Check if banner was already dismissed this session
+onMounted(() => {
+  if (process.client) {
+    const dismissed = sessionStorage.getItem('interest-duplicates-banner-dismissed');
+    if (dismissed === 'true') {
+      showBanner.value = false;
+      return;
+    }
+  }
+  
+  // Check for duplicates for sales/admin users
+  // Small delay to let other components load first
+  setTimeout(checkForDuplicates, 2000);
+});
+</script>
diff --git a/pages/dashboard/interest-list.vue b/pages/dashboard/interest-list.vue
index e2fc7d7..f8dbb7a 100644
--- a/pages/dashboard/interest-list.vue
+++ b/pages/dashboard/interest-list.vue
@@ -1,8 +1,8 @@
 <template>
   <div>
     <v-container fluid>
-      <!-- Duplicate notification banner for admins -->
-      <DuplicateNotificationBanner />
+      <!-- Duplicate notification banner for sales/admin -->
+      <InterestDuplicateNotificationBanner />
       
       <!-- Header Section -->
       <v-row class="mb-4 mb-md-6">
diff --git a/server/api/interests/duplicates/find.ts b/server/api/interests/duplicates/find.ts
new file mode 100644
index 0000000..51b6179
--- /dev/null
+++ b/server/api/interests/duplicates/find.ts
@@ -0,0 +1,325 @@
+import { requireSalesOrAdmin } from '~/server/utils/auth';
+import { getNocoDbConfiguration } from '~/server/utils/nocodb';
+import { logAuditEvent } from '~/server/utils/audit-logger';
+
+export default defineEventHandler(async (event) => {
+  console.log('[INTERESTS] Find duplicates request');
+
+  try {
+    // Require sales or admin access for duplicate detection
+    await requireSalesOrAdmin(event);
+
+    const query = getQuery(event);
+    const threshold = query.threshold ? parseFloat(query.threshold as string) : 0.8;
+    const dateRange = query.dateRange ? parseInt(query.dateRange as string) : 365; // Default 1 year
+
+    // Get all interests from NocoDB
+    const config = getNocoDbConfiguration();
+    const interestTableId = "mbs9hjauug4eseo"; // Interest table ID
+    
+    let url = `${config.url}/api/v2/tables/${interestTableId}/records`;
+    
+    // Add date filtering if specified
+    if (dateRange && dateRange > 0) {
+      const cutoffDate = new Date();
+      cutoffDate.setDate(cutoffDate.getDate() - dateRange);
+      const dateFilter = `(Created At,gte,${cutoffDate.toISOString()})`;
+      url += `?where=${encodeURIComponent(dateFilter)}`;
+    }
+    
+    const response = await $fetch(url, {
+      headers: {
+        'xc-token': config.token
+      },
+      params: {
+        limit: 5000 // Get a large batch for duplicate detection
+      }
+    }) as any;
+
+    const interests = response.list || [];
+    console.log('[INTERESTS] Analyzing', interests.length, 'interests for duplicates');
+
+    // Find potential duplicates
+    const duplicateGroups = findDuplicateInterests(interests, threshold);
+
+    console.log('[INTERESTS] Found', duplicateGroups.length, 'duplicate groups');
+
+    // Log the audit event
+    await logAuditEvent(event, 'FIND_INTEREST_DUPLICATES', 'interest', {
+      changes: {
+        totalInterests: interests.length,
+        duplicateGroups: duplicateGroups.length,
+        threshold,
+        dateRange
+      }
+    });
+
+    return {
+      success: true,
+      data: {
+        duplicateGroups,
+        totalInterests: interests.length,
+        duplicateCount: duplicateGroups.reduce((sum, group) => sum + group.interests.length, 0),
+        threshold,
+        dateRange
+      }
+    };
+
+  } catch (error: any) {
+    console.error('[INTERESTS] Failed to find duplicates:', error);
+    
+    if (error.statusCode === 403) {
+      return {
+        success: false,
+        error: 'Insufficient permissions. Sales or admin access required.'
+      };
+    }
+
+    return {
+      success: false,
+      error: 'Failed to find duplicates'
+    };
+  }
+});
+
+/**
+ * Find duplicate interests based on multiple criteria
+ */
+function findDuplicateInterests(interests: any[], threshold: number = 0.8) {
+  const duplicateGroups: Array<{
+    id: string;
+    interests: any[];
+    matchReason: string;
+    confidence: number;
+    masterCandidate: any;
+  }> = [];
+
+  const processedIds = new Set<number>();
+
+  for (let i = 0; i < interests.length; i++) {
+    const interest1 = interests[i];
+    
+    if (processedIds.has(interest1.Id)) continue;
+
+    const matches = [interest1];
+    
+    for (let j = i + 1; j < interests.length; j++) {
+      const interest2 = interests[j];
+      
+      if (processedIds.has(interest2.Id)) continue;
+
+      const similarity = calculateSimilarity(interest1, interest2);
+      
+      if (similarity.score >= threshold) {
+        matches.push(interest2);
+        processedIds.add(interest2.Id);
+      }
+    }
+
+    if (matches.length > 1) {
+      // Mark all as processed
+      matches.forEach(match => processedIds.add(match.Id));
+
+      // Determine the best master candidate (most complete record)
+      const masterCandidate = selectMasterCandidate(matches);
+      
+      // Calculate average confidence
+      const avgConfidence = matches.slice(1).reduce((sum, match) => {
+        return sum + calculateSimilarity(masterCandidate, match).score;
+      }, 0) / (matches.length - 1);
+      
+      duplicateGroups.push({
+        id: `group_${duplicateGroups.length + 1}`,
+        interests: matches,
+        matchReason: generateMatchReason(matches),
+        confidence: avgConfidence,
+        masterCandidate
+      });
+    }
+  }
+
+  return duplicateGroups;
+}
+
+/**
+ * Calculate similarity between two interests
+ */
+function calculateSimilarity(interest1: any, interest2: any) {
+  const scores: Array<{ type: string; score: number; weight: number }> = [];
+
+  // Email similarity (highest weight)
+  if (interest1['Email Address'] && interest2['Email Address']) {
+    const emailScore = normalizeEmail(interest1['Email Address']) === normalizeEmail(interest2['Email Address']) ? 1.0 : 0.0;
+    scores.push({ type: 'email', score: emailScore, weight: 0.4 });
+  }
+
+  // Phone similarity
+  if (interest1['Phone Number'] && interest2['Phone Number']) {
+    const phone1 = normalizePhone(interest1['Phone Number']);
+    const phone2 = normalizePhone(interest2['Phone Number']);
+    const phoneScore = phone1 === phone2 ? 1.0 : 0.0;
+    scores.push({ type: 'phone', score: phoneScore, weight: 0.3 });
+  }
+
+  // Name similarity
+  if (interest1['Full Name'] && interest2['Full Name']) {
+    const nameScore = calculateNameSimilarity(interest1['Full Name'], interest2['Full Name']);
+    scores.push({ type: 'name', score: nameScore, weight: 0.2 });
+  }
+
+  // Address similarity
+  if (interest1.Address && interest2.Address) {
+    const addressScore = calculateStringSimilarity(interest1.Address, interest2.Address);
+    scores.push({ type: 'address', score: addressScore, weight: 0.1 });
+  }
+
+  // Calculate weighted average
+  const totalWeight = scores.reduce((sum, s) => sum + s.weight, 0);
+  const weightedScore = scores.reduce((sum, s) => sum + (s.score * s.weight), 0) / (totalWeight || 1);
+
+  return {
+    score: weightedScore,
+    details: scores
+  };
+}
+
+/**
+ * Normalize email for comparison
+ */
+function normalizeEmail(email: string): string {
+  return email.toLowerCase().trim();
+}
+
+/**
+ * Normalize phone number for comparison
+ */
+function normalizePhone(phone: string): string {
+  return phone.replace(/\D/g, ''); // Remove all non-digits
+}
+
+/**
+ * Calculate name similarity using Levenshtein distance
+ */
+function calculateNameSimilarity(name1: string, name2: string): number {
+  const str1 = name1.toLowerCase().trim();
+  const str2 = name2.toLowerCase().trim();
+  
+  if (str1 === str2) return 1.0;
+  
+  const distance = levenshteinDistance(str1, str2);
+  const maxLength = Math.max(str1.length, str2.length);
+  
+  return maxLength > 0 ? 1 - (distance / maxLength) : 0;
+}
+
+/**
+ * Calculate string similarity using Levenshtein distance
+ */
+function calculateStringSimilarity(str1: string, str2: string): number {
+  const s1 = str1.toLowerCase().trim();
+  const s2 = str2.toLowerCase().trim();
+  
+  if (s1 === s2) return 1.0;
+  
+  const distance = levenshteinDistance(s1, s2);
+  const maxLength = Math.max(s1.length, s2.length);
+  
+  return maxLength > 0 ? 1 - (distance / maxLength) : 0;
+}
+
+/**
+ * Calculate Levenshtein distance between two strings
+ */
+function levenshteinDistance(str1: string, str2: string): number {
+  const matrix = Array(str2.length + 1).fill(null).map(() => Array(str1.length + 1).fill(null));
+
+  for (let i = 0; i <= str1.length; i += 1) {
+    matrix[0][i] = i;
+  }
+
+  for (let j = 0; j <= str2.length; j += 1) {
+    matrix[j][0] = j;
+  }
+
+  for (let j = 1; j <= str2.length; j += 1) {
+    for (let i = 1; i <= str1.length; i += 1) {
+      const indicator = str1[i - 1] === str2[j - 1] ? 0 : 1;
+      matrix[j][i] = Math.min(
+        matrix[j][i - 1] + 1, // deletion
+        matrix[j - 1][i] + 1, // insertion
+        matrix[j - 1][i - 1] + indicator // substitution
+      );
+    }
+  }
+
+  return matrix[str2.length][str1.length];
+}
+
+/**
+ * Select the best master candidate from a group of duplicates
+ */
+function selectMasterCandidate(interests: any[]) {
+  return interests.reduce((best, current) => {
+    const bestScore = calculateCompletenessScore(best);
+    const currentScore = calculateCompletenessScore(current);
+    
+    return currentScore > bestScore ? current : best;
+  });
+}
+
+/**
+ * Calculate completeness score for an interest record
+ */
+function calculateCompletenessScore(interest: any): number {
+  const fields = ['Full Name', 'Email Address', 'Phone Number', 'Address', 'Extra Comments', 'Berth Size Desired'];
+  const filledFields = fields.filter(field => 
+    interest[field] && interest[field].toString().trim().length > 0
+  );
+  
+  let score = filledFields.length / fields.length;
+  
+  // Bonus for recent creation
+  if (interest['Created At']) {
+    const created = new Date(interest['Created At']);
+    const now = new Date();
+    const daysOld = (now.getTime() - created.getTime()) / (1000 * 60 * 60 * 24);
+    
+    // More recent records get a small bonus
+    if (daysOld < 30) score += 0.1;
+    else if (daysOld < 90) score += 0.05;
+  }
+  
+  return score;
+}
+
+/**
+ * Generate a descriptive match reason
+ */
+function generateMatchReason(interests: any[]): string {
+  const reasons = [];
+  
+  // Check for exact email matches
+  const emails = interests.map(i => i['Email Address']).filter(Boolean);
+  if (emails.length > 1 && new Set(emails.map(e => normalizeEmail(e))).size === 1) {
+    reasons.push('Same email address');
+  }
+  
+  // Check for exact phone matches
+  const phones = interests.map(i => i['Phone Number']).filter(Boolean);
+  if (phones.length > 1 && new Set(phones.map(p => normalizePhone(p))).size === 1) {
+    reasons.push('Same phone number');
+  }
+  
+  // Check for similar names
+  const names = interests.map(i => i['Full Name']).filter(Boolean);
+  if (names.length > 1) {
+    const normalizedNames = names.map(n => n.toLowerCase().trim());
+    if (new Set(normalizedNames).size === 1) {
+      reasons.push('Same name');
+    } else {
+      reasons.push('Similar names');
+    }
+  }
+  
+  return reasons.length > 0 ? reasons.join(', ') : 'Multiple matching criteria';
+}