Valdimar is a given name in Icelandic. Notable persons with that surname include:
First nameValdimar Bergstað (born 1989), Icelandic equestrianValdimar Grímsson (born 1965), Icelandic handball playerValdemar, King of Sweden (1239–1302), king in 1250–1275 (in Icelandic Valdimar Birgisson)Middle nameKristjan Valdimar "Val" Bjornson, or Val Bjornson (1906-1987), American writer, newspaper editor, and politicianMusicValdimar (band), Icelandic musical group