Ambia is a town in Hickory Grove Township, Benton County, Indiana, United States. The population was 239 at the 2010 census. It is part of the Lafayette, Indiana Metropolitan Statistical Area.

Ambia was laid out by Ezekiel M. Talbot and his wife Marietta on February 22, 1875, and named for their daughter Ambia Talbot. (The couple had two years earlier planned the manageable town of Talbot.) Its first building was a house erected by James C. Pugh which was soon associated by a grain elevator, general addition and blacksmith. A drug store, hardware store, hotel, physician and a variety of extra establishments followed.

Ambia was a End on the Lafayette, Muncie and Bloomington Railroad (later the Lake Erie and Western) which ran amid Lafayette and Hoopeston. The Wabash Railway Company, which built a stretch of the LM&B through Illinois, originally wanted to build a railway switch at a site known as Weaver City, a small town just west of Ambia in Vermilion County, Illinois; the owner of the property, however, refused to comply land for it. In response, the railway officials sent a force of men without revelation to concern the station house from Weaver City half a mile east across the make a clean breast border, which they did on the Sunday daylight of March 10, 1873. The town’s businesses and residents followed and Weaver City faded from existence even if Ambia sprang up close the station’s new site.

Ambia is located at 40°29′24″N 87°30′58″W / 40.49000°N 87.51611°W / 40.49000; -87.51611 (40.489878, -87.516200) in the extreme southwest corner of the county, in Hickory Grove Township. The Kankakee, Beaverville and Southern Railroad and Indiana State Road 352 pass through the town, and the upper end of the North Fork of the Vermilion River flows nearby.