Frank McCoppin (July 4, 1834 – May 26, 1897) was the first Irish-born, and foreign-born Mayor of San Francisco.

In 1860, he was made supervisor of the Market Street Railway, where he encouraged planting among the railroad tracks, to lessen the problem of drifting sands.

In 1886, he ran for a seat in the United States House of Representatives but lost to William W. Morrow.

In 1894, President Grover Cleveland appointed him Postmaster of San Francisco, a position he held until his death from stomach cancer on May 26, 1897.

He is credited with recommending the use of ladybugs to control insect pests affecting the California citrus crop.