Ljunggren is a surname. Notable people with the surname include:
Anna Elisabeth Ljunggren, née Storm-Mathisen (1943–2010), Norwegian physiotherapistAnna Ljunggren (born 1984), Norwegian politician for the Labour PartyBobby Ljunggren (born 1961), Swedish songwriterGustaf Ljunggren (1823–1905), Swedish man of letters, born at Lund, the son of a clergymanJohn Ljunggren (1919–2000), Swedish athlete who competed mainly in the 50 kilometer walkMichael Ljunggren (1962–1995), Swedish mobster and President of the Bandidos Motorcycle Club's Swedish chaptersSten Ljunggren (born 1938), Swedish character actorWIlhelm Ljunggren (1905–1973), Norwegian mathematician, specializing in number theory