Winter King may refer to:

• A derisive sobriquet applied to Frederick V of the Palatinate
• The Winter King (character) , a character in the TV series Adventure Time: Fionna and Cake
• "The Winter King" (episode), a 2023 episode of the TV series Adventure Time: Fionna and Cake
• The Winter King (novel), novel of The Warlord Chronicles trilogy by Bernard Cornwell
• The Winter King (TV series), British Arthurian fiction television series, based on the Cornwell novels
• 'Winter King', a cultivar of Crataegus viridis (green hawthorn)