Frank Earle Schoonover was an American illustrator who worked in Wilmington, Delaware. A member of the Brandywine School, he was a contributing illustrator to magazines and did more than 5,000 paintings.

Schoonover was born on August 19, 1877 in Oxford, New Jersey. He studied under Howard Pyle at the Drexel Institute in Philadelphia.

Schoonover became part of what would be known as the Brandywine School. A prolific contributor to books and magazines during the early twentieth century, the so-called "Golden Age of Illustration", he illustrated stories as diverse as Clarence Mulford's Hopalong Cassidy stories and Edgar Rice Burroughs's A Princess of Mars. In 1918 and 1919, he produced a series of paintings along with Gayle Porter Hoskins illustrating the American forces in the First World War for a series of souvenir prints published in the Ladies Home Journal. Over the course of his career, he did more than 5,000 paintings.

Schoonover helped to organize what is now the Delaware Art Museum and was chairman of the fundraising committee charged with acquiring works by Howard Pyle. In his later years he restored paintings including some by Pyle and turned to easel paintings of the Brandywine and Delaware landscapes. He also gave art lessons, established a small art school in his studio, designed stained glass windows, and dabbled in science fiction art (illustrating Edgar Rice Burroughs’ A Princess of Mars), he was known locally as the “Dean of Delaware Artists.”

Schoonover died on September 1, 1972 in Wilmington, Delaware, at 95.