Arthur is an animated television series for children ages 4 to 8, developed by Kathy Waugh for PBS and produced by WGBH Boston. The show is set in the fictional U.S. city of Elwood City and revolves around the lives of Arthur Read, an anthropomorphic aardvark, his friends and family, and their daily interactions with each other. The television series is based on the Arthur book series written and illustrated by Marc Brown. Production on the series was first announced in 1995 by WGBH and Montreal-based animation studio CINAR, and aired its first episode on October 7, 1996. During its 25-season run, the show broadcast 253 half-hour episodes.

In June 2018, Arthur was renewed for four additional seasons, through its 25th season. It was subsequently announced on July 27, 2021, that the 25th season would be the final season. Arthur concluded its original run on PBS Kids on February 21, 2022.

Arthur has received praise for dealing with important issues that families face, such as asthma, dyslexia, cancer, diabetes, and autism. It also encourages reading and relationships with family and friends by explaining that people have different personalities, beliefs and interests. It was the longest-running children's animated series in the U.S. until it was surpassed by SpongeBob SquarePants in 2025, and is the fifth longest-running animated series in the U.S., behind The Simpsons, South Park, Family Guy, and SpongeBob SquarePants.