Bert M. Gretzinger (born April 7, 1951) is a Canadian curler. He was a member of the gold medal winning Canadian team at the 1994 World Men's Curling Championship.
He also won a bronze medal at the 2001 Canadian Olympic Curling Trials, where he lost to Kerry Burtnyk in the semifinal 7-5.
He was known for his ability to make big shots which overcame his inconsistency to some extent. He has played skip, third, and second at various points in his career.