Jean Baptiste Loeillet (6 July 1688 – c. 1720), who later styled himself Loeillet de Gant, was a Flemish composer, born in Ghent. He spent the largest part of his life in France in service to the archbishop of Lyon, Paul-François de Neufville de Villeroy. He wrote many works for recorder, including trio sonatas, unaccompanied sonatas for 2 recorders, and solo sonatas. He died in Lyon around 1720.

Jean Baptiste Loeillet was a member of the large and musical Loeillet family, and the son of Pieter Loeillet).

Loeillet added “de Ghent” to his surname to avoid confusion with his cousin, Jean-Baptiste Loeillet of London (1680–1730), who was a well-known musician and composer in London. The similar names have often caused confusion and mis-attribution of works!