Federico "Fritz" Dennerlein (14 March 1936 – 3 October 1992) was an Italian freestyle and butterfly swimmer and water polo player who competed in the 1956, 1960 and 1964 Summer Olympics.

He finished fourth in the water polo tournaments in 1956 and 1964, and in the 200 m butterfly event in 1960.

[1] Dennerlein was born to a German father and Romanian mother; he had an elder brother Costantino, also a competitive swimmer.

Since 1984 he trained the national water polo team, bringing it to a silver medal at the 1986 World Championships.

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