Gaston Fanty-Lescure lived in Paris, where he was likely born. He painted genre scenes of working people, often inspired by female occupations. He studied with Fernand Cormon. He exhibited in Paris at the Salon des Artistes Français of which he was a member in 1903. He earned an Honorable Mention in 1905 and a Third class medal in 1910. 

In 1888 he exhibited Bibelots Japonais, a still-life of Japanese curios in the Salon in Saintonge. In 1904 he showed Le Proëlla, cérémonie bretonne at the Salon. In 1911 Fanty-Lescure exhibited La leçon de lecture at the Société des Artistes-Français. 

Fanty-Lescure also was known for illustrating books, most famously, Mrs. Frances Gostling’s The Bretons At Home in 1909.

His address was 42, Rue Fontaine which was the same address as Mlle. Emma Fanty-Lescure. The artist died in July 1914.