Lyman is a town in York County, Maine, United States.

While the original settlers are not known for certain, early records and deeds mention the following: William and Jacob Waterhouse (of Kennebunk), Love Roberts, Alexander Grant, Thomas Lord, Jacob Rhoades, Benjamin and Mark Goodwin (brothers who built one of the first mills at Goodwin's Mills), John Low (who served as town moderator and treasurer), John Burbank, Joseph Witten, James and William Brock, Mark Ricker, Robert Cousens, Valentine Hill, and Gershom Downs.

On February 25, 1803, the name was changed to Lyman in honor of Theodore Lyman, a wealthy merchant who established a successful shipping firm in the 1790s at York before moving to Boston.

[4] Farmers found the surface of the town moderately uneven, with fair soil that yielded good crops of grain, hay and apples.

In 1782, a sawmill and gristmill were erected at Goodwin's Mills, which developed into the town's only business and trade center, despite the fact that some of the village is actually located in Dayton.

It is bordered by the towns of Hollis and Dayton to the northeast, Arundel and Kennebunk to the southeast, Alfred to the southwest, and Waterboro to the northwest.

There were 2,067 housing units at an average density of 53.0 per square mile (20.5/km2).

16.9% of all households were made up of individuals, and 6.7% had someone living alone who was 65 years of age or older.

12.5% of all households were made up of individuals, and 3.5% had someone living alone who was 65 years of age or older.