Lay is a surname. Notable people with the surname include:

Alfred Morrison Lay (1836–1879), American politician Beirne Lay, Jr. (1909–1982), American author and World War II aviator Benjamin Lay (1681–1760), English Quaker and abolitionist Bob Lay (1944–2022), Australian sprinter Brandon Lay, American singer-songwriter Caren Lay (born 1972), German politician Carol Lay (born 1952), American author Cecil Howard Lay (1885–1956), English poet Charles Downing Lay (1877–1956), American landscape architect Donald P. Lay (1926–2007), American jurist Elzy Lay (1868–1934), U.S. outlaw George W. Lay (1798-1860), U.S. politician George Tradescant Lay (c. 1800–1845), British naturalist, missionary and diplomat Herman Lay (1909–1982), American businessman Horatio Nelson Lay (1832–1898), British diplomat Humberto Lay (born 25 September 1934), Peruvian evangelical pastor Jeffrey Lay (born 1969), Canadian rower John Louis Lay (1832–1899), American inventor Josh Lay (born 1982), American football player Kenneth Lay (1942–2006), U.S. businessman Ken Lay (police officer) (born 1956), Australian police commissioner Ko Lay (born 31 October 1931), Burmese politician Oliver Ingraham Lay (1845-1890), American portrait painter. Sam Lay (1935–2022), American drummer and vocalist Stan Lay (1906–2003), New Zealand track and field athlete Susan Lay (born March 13, 1985), English actress, musician, and TV presenter