Seth Grosvenor Heacock (March 1, 1857 – December 4, 1928) was an American politician from New York.

On July 22, 1880, he married Ida May Walker (born 1858), and they had two children.

[1] They lived in Ilion, Herkimer County, New York, and became wealthy after oil was found on a farm he owned in Ohio.

[2] He ran for Lieutenant Governor of New York in the Republican primaries for the State elections in 1914 and 1918, but was both times defeated by Edward Schoeneck.

[3] Heacock died on December 4, 1928, in Presbyterian Hospital in Manhattan.