Samuel Gene Kooistra (August 18, 1935 – September 18, 2010) was an American water polo player who competed in the 1956 Summer Olympics.

He was born in Chicago and is the younger brother of William Kooistra.

Kooistra was a member of the American water polo team which finished fifth in the 1956 Olympic tournament.

In 1977, he was inducted into the USA Water Polo Hall of Fame.

This biographical article relating to a water polo figure from the United States is a stub.