Deignan is a surname that could refer to: Elizabeth Mary "Lizzie" Deignan (born 1988), English cyclist Herbert Girton Deignan (1906-1968), American ornithologist Kathleen Deignan (born 1947), Irish-American theologian, author and singer Martina Deignan (late 20th c.), American actress Osborn Deignan (1873-1915), American navy sailor and Warrant Officer) Philip Deignan (born 1983), Irish cyclist Simon Deignan (1922–2006), Gaelic football player