Portner is a surname. Notable people with the surname include:
Abby Portner (born 1980), American musician David Portner (born 1979), American musician, known as Avey Tare Emil Pørtner (born 2000), Danish motorcycle speedway rider Emma Portner (born 1994), Canadian dancer and choreographer Margit Pörtner (1972–2017), Danish curler Nikola Portner (born 1993), Swiss handball player Paul Portner (born 1966), American linguist Peer Portner (1940–2009), heart researcher Robert Portner (1837–1906), American brewer Zlatko Portner (1962–2020), Serbian handball player and coach