Aina Onabolu (b. 1882-1963) was a pioneering Nigerian modern arts teacher and painter. He promoted the drawing of environmental forms in a verisimilitudinous style and was known for his early modern work in portraiture.

Onabolu’s major artworks were portraits. His portrait of Mrs. Spencer Savage in 1906 is sometimes credited as one of the earliest outstanding works of art in Nigeria that used a western and modern style and technique. Another major work of his was the portrait of Dr. Randle, a Nigerian political figure of the era. The latter was his mentor, and was the person who got his attention onto the deleterious characteristics of colonialism which were exemplified by a segregationist governor in the person of Walter Egerton. He also made a portrait of the medical pioneer Chief (Dr.) Sapara, which was in watercolor.

Several of his portraits are held in the National Gallery of Modern Art, Lagos. His portrait of the aristocratic socialite Princess Obasa was part of the Nigerian Modernism exhibition at Tate Modern in London, Great Britain, in 2025.