The third series of On the Buses originally aired between 2 January 1970 and 27 March 1970, beginning with "First Aid". The series was produced and directed by Stuart Allen for the first ten episodes. The last three episodes were directed by Howard Ross and produced by Stuart Allen. The designer for the series was Andrew Gardner. All the episodes in this series were written by Ronald Chesney and Ronald Wolfe.

On the Buses is a British television sitcom that was broadcast on ITV from 1969 to 1973. It was created by Ronald Chesney and Ronald Wolfe, who wrote most of the episodes. It spawned three spin-off feature films and a stage version. Despite the writers' previous successes with The Rag Trade and Meet the Wife with the BBC, the corporation rejected On the Buses, not seeing much comedy potential in a bus depot as a setting. The comedy partnership turned to Frank Muir, Head of Entertainment at London Weekend Television (LWT), who loved the idea; the show was accepted, and despite a poor critical reception became a hit with viewers.