Rieber may refer to:

• John Ney Rieber, an American comic book writer
• Paul-Christian Rieber (born 1958), a Norwegian business leader
• Torkild Rieber (1882–1968), a Norwegian immigrant to the United States who became chairman of Texaco
• Georg Fredrik Rieber-Mohn (born 1945), a Norwegian judge
• Hallvard Rieber-Mohn (1922–1982), a Norwegian writer and Dominican priest
• Libe Rieber-Mohn (born 1965), a Norwegian politician for the Labour Party

• Rieber & Søn, a Norwegian food manufacturing company
• GC Rieber, a private company that operates within the fields of marine oils, pelts, salt including for agriculture and nutrients.
• GC Rieber Shipping, a Norwegian shipping company based in Bergen, Norway
• Rieber Hall, a student residence at the University of California, Los Angeles

• The Nymphomaniac (film)
• & Then You Shoot Your Cousin
• The NY Post
• The NYU Game Center
• The nzavs
• The NZ Transport Agency
• The Nærøy manuscript
• Theo-11
• Theo 24
• The O2 Arena (London)
• The O2 Dublin
• The O2 (Dublin)
• The O2 (London)
• The OA
• Theo Adams (American football)
• The Oak Cliff Tribune
• The Oakdale Affair
• The Oakdale Affair and The Rider
• The Oakes, Sheffield
• The Oaklahoman
• The Oaklands Historic District
• The Oakleaf Bearers
• The Oak Parker
• The Oak Park Regional Housing Center
• The Oak Ridger