Johan Frederik Marie "Hans" Houtzager (26 August 1910 – 29 December 1993) was a Dutch hammer thrower. He competed at the 1936 and 1948 Summer Olympics and finished in 12th place in 1948. Two years earlier he was fifth at the 1946 European Athletics Championships.^[1]

Houtzager retired from competitions in 1952, shortly after winning his last national title. His son Hans Houtzager Jr. also competed in the hammer throw and became the national champion in 1969.^[2]