diff --git a/src/Python/Problem066.py b/src/Python/Problem066.py
new file mode 100644
index 0000000..292904c
--- /dev/null
+++ b/src/Python/Problem066.py
@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+"""
+Created on 08 Sep 2023
+
+@author: David Doblas Jiménez
+@email: daviddoji@pm.me
+
+Solution for problem 066 from Project Euler
+https://projecteuler.net/problem=66
+"""
+
+from sympy import simplify
+from sympy.abc import t, x, y
+from sympy.solvers.diophantine.diophantine import diop_quadratic
+from utils import timeit
+
+
+@timeit("Problem 066")
+def compute():
+    """
+    # Statement
+    """
+
+    max_d, max_x = 0, 0
+    for d in range(2, 1000):
+        solve = diop_quadratic(x**2 - d * y**2 - 1, t)
+        for i in solve:
+            sol = simplify(i.subs({t: 0}))
+            xx = sol[0]
+            if xx > max_x:
+                max_x = xx
+                max_d = d
+
+    return max_d
+
+
+if __name__ == "__main__":
+    print(f"Result for Problem 066 is {compute()}")