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