Dub can refer to:

• dub music, a sub-genre of reggae music
• a mostly-instrumental remix (usually without lyrics but still with chorus)
• Dubbing is the process of recording or replacing voices for a motion picture.
• Video/DVD dubbing is the copying of audio and video information, particularly to or from tape.
• the Celtic god, see the entry Carman
• mud, or dirt.
• (with capital initial) a colloquial term for a Dubliner.