Lloyd Hahn (August 7, 1898 – January 1983) was an American runner who competed at the 1924 and 1928 Olympics.

Earlier in 1928 Hahn won the 800 m race at the US Olympic trials, which were combined with AAU Championships that year, setting a new world record at 1:51.4, but the record was not ratified by the IAAF.

In 1926 Hahn was part of the US 4×880 yd relay team that broke the world record.

After retiring from competitions Hahn worked as athletics coach, with Gil Dodds among others.

This biographical article about an American middle distance runner is a stub.