Leonie Tonel (died 1886) was a French pianist and composer. The earliest mention of Tonel was in 1855, when La Presse wrote: "Mlle Léonie Tonèl will be heard at the Exposition [Universelle des produits de l'Agriculture, de l'Industrie et des Beaux-Arts de Paris 1855] on Tuesdays, Thursdays, and Fridays, from 2 PM until 5 PM, on the excellent piano from the house of A. Bord."