Pengelly is a surname. Notable people with the surname include:
Edna Pengelly (1874–1959), New Zealand teacher and nurse Emma Little-Pengelly (born 1979), Northern Ireland politician J. Isaac Pengelly (1853–1937), English clerk and activist Jessica Pengelly (born 1991), South African-born Australian swimmer Melville Pengelly (1901–1973), New Zealand cricket umpire Nigel Pengelly (1925–2010), Canadian politician Thomas Pengelly (merchant) (fl. c.1660–1715), London merchant with whom Richard Cromwell lodged Sir Thomas Pengelly (judge) (1675–1730), judge and Member of Parliament for Cockermouth, Cumberland, son of the above Thomas Pengelly (disambiguation), multiple people William Pengelly (1812–1894), British geologist and archaeologist