Jean-Marie Leclair l'aîné, also known as Jean-Marie Leclair the Elder, (10 May 1697 – 22 October 1764) was a Baroque violinist and composer. He is considered to have founded the French violin school. His brothers Jean-Marie Leclair the younger (1703–77), Pierre Leclair (1709–84) and Jean-Benoît Leclair (1714–after 1759) were also musicians.
Leclair was born in Lyon, but left to study dance and the violin in Turin. In 1716, he married Marie-Rose Casthanie, a dancer, who died about 1728. Leclair had returned to Paris in 1723, where he played at the Concert Spirituel, the main semi-public music series. His works included several sonatas for flute and basso continuo.