George Gillis Haanen, was a 19th-century landscape painter from the Northern Netherlands.

He was born in Utrecht as the son of the painter and paper silhouette cutter Casparis Haanen, and brother of the painters Adriana Johanna Haanen, Elisabeth Alida Haanen and Remigius Adrianus Haanen. He became a member of "Arti Sacrum" in 1831 in Rotterdam, and became a member of the Royal Academy of Amsterdam in 1835. He traveled and worked along the Rhine and Austria, and is known for landscapes. He died in Bilsen.