Professor Poopsnagle's Steam Zeppelin (aka Professor Poopsnaggle and His Flying Zeppelin) is a children's television series, created as a spin-off of Secret Valley. It was produced by the Grundy Organisation from Australia, in association with Revcom Television from France, Katholieke Radio Omroep (KRO) from the Netherlands, and Televisión Española (TVE) from Spain. It was first aired in 1986 on the Nine Network in Australia, in 1987 on TVE 1 in Spain, and in 1989 on RKO in the Netherlands.

The series was also aired in Switzerland (TSI), Finland (1987), Greece (1988, ET1), France (1989, FR3), and Vietnam (1996, VTV3). In contrast to Secret Valley, which was a commercial failure in the United Kingdom when screened there in 1985, Professor Poopsnagle's Steam Zeppelin was hugely successful in the UK, where it was first broadcast in 1987 on the ITV network, and proved so popular that it was also later repeated on Channel 4 in both 1990 and 1998. The series still has a strong cult following in the United Kingdom today.

The overall story is divided into 6 parts, each for a particular quest, with 4 episodes each. Some TV channels, such as ITV Anglia, therefore showed the series as TV movies of 90 minutes each. In this form the story is slightly abridged, cutting a few scenes that are present in cut for a half-hour slot.