Garretson Beekman Trudeau (born July 21, 1948) is an American cartoonist best known for creating the Doonesbury comic strip.

Trudeau won the Pulitzer Prize for Editorial Cartooning in 1975, making him the first comic strip artist to win a Pulitzer. He is one of only two comic strip artists to win the award, the other being Berkeley Breathed, whose work was influenced by Trudeau. Trudeau was also the creator and executive producer of the Amazon Studios political comedy series Alpha House.

Trudeau was born in New York City, the son of Jean Douglas (née Moore, daughter of New York Assembly member Thomas Channing Moore) and Francis Berger Trudeau Jr. He is the great-grandson of Edward Livingston Trudeau, who created Adirondack Cottage Sanitarium for the treatment of pulmonary tuberculosis at Saranac Lake, New York. Edward was succeeded by his son Francis and grandson Francis Jr. The latter founded the Trudeau Institute at Saranac Lake, with which Garry Trudeau retains a connection.

Raised in Saranac Lake, Trudeau attended St. Paul's School in Concord, New Hampshire. He enrolled in Yale University in 1966. As an art major, Trudeau initially focused on painting, but soon discovered a greater interest in the graphic arts. He spent much of his time cartooning and writing for Yale's humor magazine The Yale Record, eventually serving as the magazine's editor-in-chief. At the same time, Trudeau began contributing to the Yale Daily News, which eventually led to the creation of Bull Tales, a comic strip parodying the exploits of Yale quarterback Brian Dowling. This strip was the progenitor of Doonesbury.

While still an undergraduate at Yale, Trudeau published two collections of Bull Tales: Bull Tales (1969, published by the Yale Daily News) and Michael J. (1970, published by The Yale Record).

As a senior, Trudeau became a member of Scroll and Key. He did postgraduate work at the Yale School of Art, earning a Master of Fine Arts degree in graphic design in 1973. It was there that Trudeau first met photographer David Levinthal, with whom he collaborated on Hitler Moves East, an influential "graphic chronicle" of the German invasion of the Soviet Union.

Soon after Bull Tales began running in the Yale student newspaper, the strip caught the attention of the newly formed Universal Press Syndicate. The syndicate's editor, James F. Andrews, recruited Trudeau, changed the strip's name to Doonesbury, and began distributing it following the cartoonist's graduation in 1970. Today Doonesbury is syndicated to 1,000 daily and Sunday newspapers worldwide and is accessible online in association with The Washington Post.

In 1975, Trudeau became the first comic strip artist to win a Pulitzer, traditionally awarded to editorial-page cartoonists. He was also a Pulitzer finalist in 1990, 2004, and 2005. Other awards during this time include the National Cartoonist Society Newspaper Comic Strip Award in 1994, the Reuben Award from the National Cartoonist Society in 1995, the George Orwell Award in 1994, and the Forte dei Marmi Prize for Satire 1990 in Italy,