Francis Jack "Frank" McEwen, OBE (19 April 1907 – 15 January 1994) was an English artist, teacher, and museum administrator. He is best remembered today for his efforts to bring attention to the work of Shona artists in Rhodesia, and for helping to found the National Gallery of Zimbabwe. He was awarded the OBE in 1963.
Born in Mexico and brought up in Devon, McEwen grew up surrounded by art from West Africa, which his father had collected on various business trips. Having attended Mill Hill School, in 1926 he went to Paris to study art history at the Sorbonne and the Institut d'Art et d'Archaeologie; there, his teacher was Henri Focillon. Through Focillon, McEwen met and befriended artists such as Constantin Brâncuși, Georges Braque, Henri Matisse, Pablo Picasso, and Fernand Léger, and gained a deal of respect for the teachings of Gustave Moreau, which were to influence much of his later career.
Upon Focillon's advice, McEwen chose to become a painter rather than a lecturer, which led to a breach with his family, as a result of which he had to support himself financially, through painting and picture restoration. He wandered around Europe for some years, taking menial jobs at power stations to fund his travels. From 1928 until 1929 he spent time in Flanders, painting wildflowers and other subjects in his spare time. He exhibited in London at both the Goupil Salon and the New English Art Club.