Liljegren is a surname. Notable people with the surname include:
Christian Liljegren (born 1971), Swedish singer Erik Liljegren, American television correspondent Freddie Liljegren (born 1993), Swedish singer Fredrik Liljegren (born 1969), Swedish computer scientist Kirstin Liljegren (born 1996), Danish fashion model Mike Liljegren, American football coach Sofia Liljegren (1765–1795), Swedish-Finnish soprano Sten Bodvar Liljegren (1885–1984), Swedish Anglist Timothy Liljegren (born 1999), Swedish ice hockey player