Casey Gardner Jacobsen (born March 19, 1981) is a retired American professional basketball player. He had an extensive European basketball career, mostly playing for Brose Baskets. There he won the German League in 2007 and 2010, and also received the German League Finals MVP Award. Following his retirement in 2014, Brose Baskets retired his jersey number.
Jacobsen played at Glendora High School, and he was a McDonald's All-American. After that, he attended Stanford University, where he scored a career high of 49 points against Arizona State University on January 31, 2002. He was a First Team All-American his sophomore year and a Second Team All-American his junior year. Jacobsen was also a three-time All-Pac-10 selection. In his three years in college with Stanford, he finished #3 in points scored (1,723), #6 in points per game (18.1), #2 in three-point goals (222), and #4 in three-point percentage (.427).
After playing for TAU Vitoria of the Spanish ACB League during the 2005-06 season, he signed a non-guaranteed contract with the Houston Rockets, and played in four preseason games with them, but was released on October 27, 2006, before the 2006-07 season began. Jacobsen then moved to the Brose Baskets (Bamberg, Germany) of the German League, where he won the German Basketball Championship in 2007, and he also earned the Finals MVP Award.
On July 1, 2008, the Grizzlies chose not to offer Jacobsen a new contract, making him an unrestricted free agent. In August 2008, he signed with the German League club ALBA Berlin.
In June 2009 Jacobsen signed a new contract with his former team Brose Baskets Bamberg in Germany. He led his team to win both the German Cup (Pokalsieger)  and German Championship  in 2010 and was again named Finals MVP.
Jacobsen re-signed with Brose Baskets Bamberg in August 2010 for the 2010-2011 season. The team again won the German Cup in April 2011. At game five of the finals he announced that he extended his contract for three more years. In May 2014, Jacobsen, alongside with his longtime teammate John Goldsberry, announced retirement from the professional basketball. In tribute to him, Brose Baskets retired his 23 jersey number.