For the unincorporated community in Nodaway County, Missouri, United States, see
Gaynor, Missouri.
Gaynor is both a surname and a given name.[1][2] Notable people with the name include:
- Adam Gaynor (born 1963), American guitarist
- Barrington Gaynor (1965–2011), Jamaican footballer
- Ciara Gaynor (born 1979), Irish camogie player
- Dave Gaynor, English drummer
- Gloria Gaynor (born 1943), American singer
- Janet Gaynor (1906–1984), American actress
- Jessie Gaynor (1863–1921), American composer
- John A. Gaynor (1846–1915), American politician in Wisconsin
- Katie Gaynor (born 1977), Australian baseball player
- Len Gaynor (born 1944), Irish hurling manager
- Len Gaynor (footballer) (1925–2017), English footballer
- Mel Gaynor (born 1960), British musician
- Mitzi Gaynor (born 1931), American actress, singer and dancer
- Pete Gaynor (born 1958), U.S. Administrator of FEMA
- Ross Gaynor (born 1987), Irish footballer
- Tomas Gaynor (born 1991), Australian rapper, singer and songwriter, known professionally as Allday
- Tommy Gaynor (born 1963), Irish footballer
- William Jay Gaynor (1849–1913), mayor of New York City