Moynahan is a family name with Irish origin and may refer to:
People Bernard Thomas Moynahan Jr. (1918–1999), American federal judge Brian Moynahan (1941–2018), English writer Bridget Moynahan (born 1971), American model and actress Julian Moynahan (1925–2014), American literary critic and novelist Mike Moynahan (1856–1899), American baseball player
Science 13620 Moynahan, an asteroid Moynahan syndrome, a skin condition
See also Minihan Monaghan (disambiguation) Monahan Moynihan (surname)