Having been drafted by the Edmonton Oilers in the 2011 NHL Entry Draft, on 29 March 2013, Rieder's playing rights were traded to the Phoenix Coyotes in exchange for Kale Kessy. At the conclusion of his major junior career in the 2012–13 season with the Kitchener Rangers of the Ontario Hockey League, on 15 April 2013, Rieder signed a three-year, entry-level contract with Phoenix. In the 2014–15 season, his second professional campaign in North America, Rieder received his first NHL recall by the Coyotes from the club's American Hockey League affiliate, the Portland Pirates, on 2 November 2014. That same day, he scored his first NHL goal, the game winner for the Coyotes. On 1 December 2014, Rieder set an NHL record by a first-year player by scoring two short-handed goals 58 seconds apart during the same penalty kill in a 5–2 win against the Edmonton Oilers. On February 21, 2018, during the 2017–18 season, Rieder were traded to the Los Angeles Kings in exchange for goaltender Darcy Kuemper. In the final stretch of the regular season, Rieder appeared in 20 games with the Kings, scoring four goals and six points. He made his Stanley Cup playoff debut in Los Angeles' first-round sweep to the Vegas Golden Knights. On July 1, 2018, as a free agent, Rieder returned to the Edmonton Oilers organization after signing a one-year, $2 million contract. Signing with the Oilers with the ambition to play alongside countryman Leon Draisaitl, Rieder was unable to contribute early in the 2018–19 season, finding himself in a bottom six checking-line role. Failing to register a goal with the Oilers after 60 games, Rieder was singled out publicly by Oilers CEO Bob Nicholson, stating their intention to not to sign him after the season, on which Nicholson later apologized. Rieder completed the season with a career low 11 assists in 67 games. On June 25, 2019, Rieder was not tendered a qualifying offer from the Oilers, releasing him as a free agent. On September 4, 2019, Rieder was invited to a professional tryout agreement with the Calgary Flames. On September 27, 2019, after a successful pre-season, he was signed to a one-year, two-way contract with the Flames.
