Osa Massen (* 13. Januar 1914 in Kopenhagen als Aase Madsen; † 2. Januar 2006 in Santa Monica, Kalifornien) war eine dänische Schauspielerin. ()
Osa Massen (January 13, 1914 - January 2, 2006) was a Danish actress who went on to become a successful movie actress in Hollywood. She became a naturalized citizen of the United States in 1941.