A gongoozler is a person who enjoys watching activity on the canals of the United Kingdom. The term is also used more generally to describe those who harbour an interest in canals and canal life, but do not actively participate.

"Gongoozler" may have been canal workers' slang for an observer standing apparently idle on the towpath. Though it was used derisively in the past, today the term is regularly used, perhaps with a little irony, by gongoozlers to describe themselves and their hobby.

The word may have arisen from words in Lincolnshire dialect: gawn and gooze, both meaning to stare or gape. It might be presumed that such an expression would date from the nineteenth century, when canals were at their peak, but the word is only recorded from the end of that century or the early twentieth. It was given wider use by the late L. T. C. Rolt, who used it in his book about canal life, "Narrow Boat", in 1944. A gawn is also a small ship of lading, such as a working-narrowboat.

The term "gongoozler" may also be used in any circumstance in which people are spectating without contributing to either the content or interest of an event.

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