• Birthplace: Atlanta, Georgia, United States
• Age: 26
• Height: 175 cm
• Weight: 55 kg
• Website: N/A

Shannon Purser (born June 27, 1997) is an American actress and voice actress. She made her acting debut in the Netflix drama series Stranger Things as Barbara "Barb" Holland, and portrays Ethel Muggs in The CW's teen drama series Riverdale. She made her film debut in the 2017 horror film Wish Upon.

Purser made her acting debut in the Netflix science fiction drama series Stranger Things. She portrayed the character Barbara Holland, an intelligent and outspoken girl, who is the best friend of Nancy Wheeler (Natalia Dyer). Despite her only being a minor character, several outlets called Barb one of their favorite characters. This role brought Purser to international fame, and earned her a Primetime Emmy Award for Outstanding Guest Actress in a Drama Series nomination.

Purser portrays Ethel Muggs in The CW's teen drama series Riverdale. In 2018, she played the titular role in the film Sierra Burgess Is a Loser. She also had a minor role in the comedy film Life of the Party, which ended up being cut. Purser also played Annabelle Bowman, a member of the drama troupe at Stanton High, in the drama Rise, and read the audiobook of Leah on the Offbeat.

Purser is currently attending Kennesaw State University. She formerly worked at a movie theater in her hometown, in Roswell, Georgia, but quit in order to focus on acting. On April 18, 2017, Purser came out as bisexual in a Twitter post.