Oudemans may refer to:

• Anthonie Cornelis Oudemans (1858–1943), a Dutch zoologist
• Jean Abraham Chrétien Oudemans (1827–1906), a Dutch astronomer
• Oudemans (crater), a crater on Mars named after Jean Abraham Chrétien Oudemans

• Blacknose shark
• Black note
• Black notes
• Black Notley
• Black Nova Scotians
• Black (novel)
• Black n' Red
• Black Nubble
• Black Nubble (Redington Township, Maine)
• Black Numenorean
• Black nunbird
• Blacknuss
• Blacko
• Black Oak
• Black Oak Heritage Park
• Black Obelisk (band)
• Black object
• Black obsidian
• Black Oceans
• Black October
• Black October (Album)
• Black October (album)
• Black Oil
• Black oil (The X-Files)
• Black oil virus