Mark Ellsworth Madsen (born January 28 1976 in Walnut Creek, California) is an American professional basketball player for the NBA's Minnesota Timberwolves.

After attending San Ramon Valley High School in Danville, California, Madsen, who is a Mormon, served for two years in Spain where he learned fluent Spanish as a missionary for his church. As a youth, he attained the rank of Eagle Scout and credits Scouting with teaching him about leadership, character, and mentoring. Passing on what he learned in Scouting, he started the Mark Madsen Minnesota Timberwolves Basketball Camp to teach basketball and character to today's youth.

Madsen played NCAA basketball at Stanford, where he finished his career ranked in the school's career top 10 in blocks and rebounds. In addition, Madsen helped the Cardinal to four NCAA tournament appearances, including a Final Four berth in 1998. Perhaps his signature moment at Stanford was his dunk and free throw that gave Stanford a lead over Rhode Island, propelling the team into the Final Four, where it lost to eventual national champion Kentucky. Madsen was a two-time All-American and a two-time All-Pac-10.

The Los Angeles Lakers selected Madsen in the first round (29th pick overall) of the 2000 NBA Draft. He contributed to the Lakers' NBA championships in 2001 and 2002, and became well known for the way he danced at the victory parades for those championships. Pictures of his flamboyant dancing style have been heavily circulated on the Internet and have gained a cult-phenomenon status. At one point he claimed that people asked him about his dance style more than about basketball.

Madsen signed with the Timberwolves as a free agent before the start of the 2003-04 NBA season. So far in 2007-08 NBA season he has come back from shoulder surgery and played a total of 5 games, 4 of which in a starting role.

His lifetime averages are 2.3 points, 2.7 rebounds and 0.4 assists and 12.3 minutes played per game.