Westenra is a surname. Notable people with the surname include:
Derrick Westenra, 5th Baron Rossmore (1853–1921), Anglo-Irish soldier and authorHayley Westenra (born 1987), New Zealand sopranoHenry Westenra, 3rd Baron Rossmore (1792–1860), Anglo-Irish Member of Parliament and peerHenry Westenra, 4th Baron Rossmore (1851–1874), Anglo-Irish soldier and peerLucy Westenra, fictional character in 1897 novel DraculaWarner Westenra, 2nd Baron Rossmore (1765–1842), Anglo-Irish landowner and politician