Hagner is a surname. Notable people with the surname include:
Alexander Burton Hagner (1826–1915), United States federal judgeMatthias Hagner (born 1974), German football player currently playing for Eintracht WetzlarMeredith Hagner (born 1987), perhaps best known for playing Liberty Ciccone in the CBS daytime drama As the World TurnsPeter V. Hagner (1815–1893), officer of ordnance who served for over 40 years in the United States Army and was Brevetted Brigadier GeneralViviane Hagner, German violinist