Asa Keyes (August 9, 1877 – October 18, 1934) was district attorney of Los Angeles County, California from June 1923 until 1928, when he was found guilty of accepting a bribe from the Julian Petroleum Company and was sentenced to five years' imprisonment.

He was paroled in October 1931, then pardoned by Governor James Rolph in August 1933.

When Thomas L. Woolwine resigned in June 1923, Keyes stepped into his position.

A year later Keyes called upon 87 department employees to resign, and he reappointed only 27 of them to form his new team.

When he died on October 18, 1934, he left his wife, Lillian, and two daughters, Elizabeth and Mrs. Fred McGuire.