diff --git a/Number Theory/Catalan_number.cpp b/Number Theory/Catalan_number.cpp
new file mode 100644
index 0000000..ca828d4
--- /dev/null
+++ b/Number Theory/Catalan_number.cpp	
@@ -0,0 +1,27 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+/* cantalan Number using Iterative dp */
+int catalanNumber( int n ){
+
+	vector<int> dp(n+1);
+
+	dp[0] = dp[1] = 1;
+
+	for(int i = 2 ; i <= n ; i++ ){
+
+		for(int j = 0 ; j <= i ; j++ ){
+
+			dp[i] += dp[j-1]*dp[i-j];
+		}
+	}
+
+	return dp[n];	
+}
+
+int main(int argc, char* argv[] ){
+
+	cout << catalanNumber(3) << '\n';
+	return 0;
+}
\ No newline at end of file