Jellett is a surname. Notable people with the surname include:
John Hewitt Jellett (1817–1888), college head, provost of Trinity College, DublinHenry Jellett (father) (died 1901), Irish Anglican priest and Dean of St Patrick's Cathedral, Dublin, father of the gynaecologistWilliam Morgan Jellett (1857–1936), Irish Unionist Member of Parliament in the UK ParliamentHenry Jellett (son) (1872–1848), Irish gynaecologist and author, son of the deanMainie Jellett (1897–1944), Irish painterJohn Holmes Jellett (1905–1971), British civil engineerRob Jellett, Canadian local politician – City Councillor in Ottawa, Ontario