Dubbing is the post-production process of recording and replacing voices on a motion picture or television soundtrack subsequent to the original shooting schedule. The term most commonly refers to the substitution of the voices of the actors shown on the screen by those of different performers, who may be speaking a different language. The procedure was sometimes practised in musicals when the actor had an unsatisfactory singing voice, and remains in use to enable the screening of audio-visual material to a mass audience in countries where viewers do not speak the same language as the original performers. "Dubbing" also describes the process of an actor's re-recording lines spoken during filming and which must be replaced to improve audio quality or reflect dialog changes. This process is called automatic dialogue replacement, or ADR for short. Music is also dubbed onto a film after editing is completed.

Foreign-language films, videos and sometimes video games are often dubbed into the local language of their target markets to increase their popularity with the local audience by making them more accessible. Dubbing is common both in theatrically released film and in television series, including Hollywood series and serialized Japanese anime that have received foreign distribution.