Ivor the Engine is a British cutout animation television series created by Oliver Postgate and Peter Firmin's Smallfilms company. It follows the adventures of a small green steam locomotive who lives in the "top left-hand corner of Wales" and works for The Merioneth and Llantisilly Rail Traction Company Limited. His friends include Jones the Steam, Evans the Song and Dai Station, among many other characters.

In 2024, to coincide with a reprint of the original book based on the series, Ivor and The Merioneth & Llantisilly Rail Traction Company Limited were inducted as the 13th (and only fictional) member of the Great Little Trains of Wales.