AIT may refer to:

• Ait, a small island found in the middle of a river or lake
• "Ait" or "Äit" is the Saterland Frisian name for the town of Friesoythe (which is the German name).

An ait (pronounced , like "eight") or eyot (pronounced , , or ) is a small island. It is especially used to refer to river islands found on the River Thames and its tributaries in England.

William Aiton (1731 – 2 February 1793) was a Scottish botanist.