Forrest Cowles Sagendorf, better known as Bud Sagendorf, was an American cartoonist, notable for his work on King Features Syndicate's Thimble Theatre Starring Popeye comic strip.

Popeye the Sailor is a fictional cartoon character created by Elzie Crisler Segar. The character first appeared on January 17, 1929, in the daily King Features comic strip Thimble Theatre. The strip was in its tenth year when Popeye made his debut, but the one-eyed sailor quickly became the lead character, and Thimble Theatre became one of King Features' most popular properties during the 1930s. Following Segar's death in 1938, Thimble Theatre was continued by several writers and artists, most notably Segar's assistant Bud Sagendorf. The strip continues to appear in first-run installments on Sundays, written and drawn by R. K. Milholland. The daily strips are reprints of old Sagendorf stories.