Charles Ignace Adélard Gill (21 October 1871 – 16 October 1918) was a Canadian artist, specialising in poetry and painting. He also worked under the alternate names Clairon and Léon Duval.
He was born at Sorel, Quebec to Charles-Ignace Gill and Marie-Rosalie Delphire Sénécal. After studies at Collège Sainte-Marie de Montréal, Collège de Nicolet and Collège Saint-Laurent, he worked in Paris under Jean-Léon Gérôme at the École des Beaux-Arts. After returning to Montreal, he established his own studio in 1894.
He also published poetry in the anthology Les soirées du Château de Ramesay (1900). After his death a volume of his poetry was published under the title Le Cap Eternité, poème suivi des étoiles filantes (1919).
Gill had one son, Roger-Charles, with his wife Georgine Bélanger (aka Gaëtane de Montreuil, m. 12 May 1902). He died at Montreal from the 1918 flu pandemic just short of his 47th birthday.