Ljunggren is a Swedish surname. Notable people with the surname include:
Anna Elisabeth Ljunggren, née Storm-Mathisen (1943–2010), Norwegian physiotherapist Anna Ljunggren (born 1984), Norwegian politician for the Labour Party Bobby Ljunggren (born 1961), Swedish songwriter Daniel Ljunggren (born 1994), Swedish ice hockey player Elisabeth Ljunggren (born 1948), Swedish swimmer Florence Ljunggren (1906–1988), American librarian Gustaf Ljunggren (academician) (1823–1905), Swedish man of letters, born at Lund, the son of a clergyman Gustaf Ljunggren (1894–1966), Swedish chemist John Ljunggren (1919–2000), Swedish athlete who competed mainly in the 50 kilometer walk Olle Ljunggren (1921–2003), Swedish middle-distance runner Michael Ljunggren (1962–1995), Swedish mobster and President of the Bandidos Motorcycle Club's Swedish chapters Sten Ljunggren (born 1938), Swedish character actor Tor Arne Bell Ljunggren (born 1962), Norwegian politician Wilhelm Ljunggren (1905–1973), Norwegian mathematician, specializing in number theory
See also Ljungan Lugeon