Harold Rudolf Foster (16 August 1892 – 25 July 25 1982; Nova Scotia, Canada)
Hal Foster, was a Canadian-American illustrator and writer best known as the creator of the comic strip Prince Valiant. His drawing style is noted for a high level of draftsmanship and attention to detail.

Born in Halifax, Nova Scotia, Canada, Foster rode his bike to the United States in 1919. In 1928, he began one of the earliest adventure comic strips, an adaptation of Edgar Rice Burroughs's Tarzan. In 1937, he created his signature strip, the weekly Prince Valiant, a fantasy adventure set in medieval times. The strip featured Foster's dextrous, detailed artwork; Foster eschewed word balloons, preferring to have narration and dialogue in captions.

Foster was a staff artist for the Hudson's Bay Company in Winnipeg and rode his bike to Chicago in 1919 where he studied at the Chicago Academy of Fine Arts and soon found illustration assignments. The illustrator J. C. Leyendecker was an early influence on Foster.

Foster's Tarzan comic strip, adapted from Edgar Rice Burroughs's novels, began October 20, 1928. Foster returned to do the Tarzan Sunday strip beginning September 27, 1931, continuing until Burne Hogarth took over the Sunday Tarzan on May 9, 1937. He soon grew tired of working on an adaptation and began planning his own creation.

William Randolph Hearst, who had long wanted Foster to do a comic strip for his newspapers, was so impressed with Foster's pitch for Prince Valiant that he promised Foster a 50-50 split of the gross income on the strip, a very rare offer in those days. Prince Valiant premiered on February 13, 1937, continuing for decades. In 1944, Foster and his wife Helen moved from Topeka to Redding Ridge, Connecticut. In 1954, the couple was seen on television's This Is Your Life. In 1971, the Fosters retired to Spring Hill, Florida. In 1967, Woody Gelman revived some of Foster's earlier work for his Nostalgia Press.

In 1970, Foster was suffering from arthritis and began planning his retirement. He had several artists draw Sunday pages before choosing John Cullen Murphy as his collaborator and permanent replacement in 1971. Murphy drew the strip from Foster scripts and pencil sketches. Foster stopped illustrating (and signing) the Prince Valiant pages in 1975. For several years, he continued writing the strip and doing fairly detailed layouts for Murphy, eventually doing less and less of both the writing and art until prolonged anaesthesia during an operation took his memory and he no longer remembered ever doing Prince Valiant.

Foster attended the Comic Art Convention in 1969, and the OrlandoCon in 1974 and 1975.

Foster was 73 when he was elected to membership in Great Britain's Royal Society of Arts, an honor given to very few Americans.

Foster died in Spring Hill in 1982.

Foster is a seminal figure in the history of comics, especially action-adventure strips. R.C. Harvey argues that Foster and Flash Gordon artist Alex Raymond "created the visual standard by which all such comic strips would henceforth be measured."

Foster's clear yet detailed panels, uncluttered by word balloons, were appreciated by contemporaries of his generation such as Lynd Ward, but perhaps his greatest impact was on the young artists who drove the Golden Age of Comics. Foster was a major influence on this generation, many of whom went on to become iconic and influential artists themselves. Joe Kubert called Foster, Raymond and Milton Caniff the “three saints” of comic art in the 1930s and 40s. Several sources have identified early work by Joe Simon, Jack Kirby and Bob Kane as swipes from Foster, and Kirby claimed that he "cannibalized" Foster's style, among others. Kirby also stated that the character design for Etrigan the Demon was an homage to Foster, taken from a Prince Valiant strip. Wally Wood was "obsessed" with Foster's work, and began copying his newspaper strips at the age of two. Frank Frazetta called Foster's work on Tarzan “perfection, a landmark in American twentieth-century art that will never be surpassed." Among the many other artists who have cited Foster as an important influence are Steve Ditko, Mark Schultz, William Stout, Bill Ward, and Al Williamson. Williamson, who met Foster on a few occasions, described him as "a very stern gentleman, very stern, no nonsense. You could never call him Hal or Harold, it's Mr. Foster. ... you don't see that kind of people anymore, the ones that really command your respect."

In his review of Prince Valiant for The Comics Journal, Matt Seneca wrote "as far as long-form serialized action comics go, the only equal to Foster American comics have produced is Kirby, and Kirby was never shy about proclaiming his debts to the master."

Foster was recognized for his work by the National Cartoonists Society with the Reuben Award in 1957, the Story Comic Strip Award in 1964, the Special Features Award in 1966 and 1967, all for Prince Valiant. He received the Elzie Segar Award in 1978 and the Gold Key Award (their Hall of Fame) in 1977. Foster was inducted into the Will Eisner Award Hall of Fame in 1996 and the Joe Shuster Canadian Comic Book Creators Hall of Fame for his contributions to comic books in 2005. The latter award was accepted on behalf of the family by writer-artist Dave Sim, a longtime admirer of Foster's work.

Foster was inducted into the Society of Illustrators Hall of Fame in 2006.