Daniel Robert Jansen is an American professional baseball catcher for the Toronto Blue Jays of Major League Baseball.

The Blue Jays promoted Jansen to the major leagues on August 12, 2018. He made his debut the following night, recording two singles in a 3–1 loss to the Kansas City Royals

He and Sean Reid-Foley became the first batterymates to debut in the same American League game since Billy Rohr and Russ Gibson did so in April 1967.

Jansen hit his first major league home run on August 14 off Royals pitcher Heath Fillmyer, breaking a 3–3 tie in a game the Blue Jays would end up winning 6–5. He finished the season hitting .247 in 31 games.

Jansen was invited to Major League spring training on January 12, 2016, and reassigned to minor league camp on March 12. He was assigned to the Advanced-A Dunedin Blue Jays for the 2016 minor league season.

After the 2016 season, the Blue Jays assigned Jansen to the Mesa Solar Sox of the Arizona Fall League. He appeared in 20 games for the Sox and hit .282 with 11 RBI and the first two triples of his professional career.

Danny Jansen's height  6 ft 2 in

Jansen attended Appleton West High School in Appleton, Wisconsin, and was drafted by the Blue Jays in the 16th round of the 2013 Major League Baseball draft.