Thomas Hayes (c. 1820 – June 24, 1868) was an Irish-born American land owner in the western addition to San Francisco in the 19th century.
In 1868, Hayes was elected as a delegate from San Francisco to the 1868 Democratic National Convention in New York City.
En route to the convention, he died of pleurisy at sea on June 24, 1868, just days from arriving in New York aboard the SS.
His coffin was then moved to the Second Avenue cemetery vault, reportedly to await transport to San Francisco aboard the next steamer.
His remains were shipped about a year later, but were temporarily interred at the Isthmus of Panama after his casket broke during the transport; they finally arrived in San Francisco on March 16, 1870.