Demie J. Mainieri (October 21, 1928 – March 13, 2019) was an American college baseball head coach who was the first junior college coach to win 1,000 career games.

[3] Mainieri became the first junior college coach to win 1,000 career games.

[4] In 1978, Mainieri skippered the Wareham Gatemen of the Cape Cod Baseball League.

[7] In 2014, Mainieri was elected into the National College Baseball Hall of Fame.

This biographical article relating to an American baseball manager or coach is a stub.