Lannon is a village in Waukesha County, Wisconsin, United States.

The village is named for William Lannon, who settled here with his bride in 1834.

In 1930 the Village of Lannon was incorporated out of parts of the Town of Menomonee.

[7] Lannon stone, a type of limestone or dolomite, is named for the town, as it was quarried here.

Menonomee Park has been described as an excellent place to photograph Lannon stone.

[12] At the 2020 census,[14] there were 1,355 people, 573 households living in the village  There were 598 housing units at an average density of 249.16 per square mile (93.44/km2).

Of the population 25 years and older, 14.1% have a high school diploma or equivalent.

29.2% of all households were made up of individuals, and 8.8% had someone living alone who was 65 years of age or older.

29.2% of all households were made up of individuals, and 9.4% had someone living alone who was 65 years of age or older.

A portion of Lannon is in the Menomonee Falls School District.

[16] Joecks Field in Lannon was the site of ESPN's first live broadcast, a softball game between the Kentucky Bourbons and the Milwaukee Schlitz.