A4000 may refer to:

• Yamaha A4000, a Yamaha sampler
• Acorn Archimedes 4000, a 1992 computer
• Adelaide Metro A-City Class 4000
• Amiga 4000, a 1992 Commodore computer

• Nezumi Kozō
• Nezu Station
• Neşet Ertaş
• NF
• Nf
• .nf
• NF2
• NF 2
• Nfa
• NFA
• N. facialis
• NFAI
• NFAK
• N'Faly Kouyate
• NFAS
• NFB
• Nfc
• NFC
• NFC Central
• NFC Championship
• NFC Championship Game
• NFC Championship game
• NFC East
• Nfc east
• NFC North