Absu or ABSU may refer to:

• Absu (band), a black metal musical group
• Absu (album), 2009 album by the band Absu
• Abzu, Mesopotamian deity also known as Absu
• Abia State University in Abia, Nigeria.
• All Bodo Students' Union, an organization seeking an independent Bodoland in India
• All Burma Students' Union, student group formed in the 1930s, and affiliated to the Dobama Asiayone