Jan Ullrich (born December 2, 1973 in Rostock, East Germany) is a German former professional road bicycle racer. In 1997, he was the first German to win the Tour de France. He went on to take five second places and a fourth in 2004 and third in 2005. He is considered one of the best time-trialists in the history of the sport. In 2006, Ullrich was barred from the Tour amid speculation of having doped. He retired in late February 2007.

Ullrich won a gold and a silver in the 2000 Summer Olympics in Sydney. He also won the 1999 Vuelta a España. Although not a one-day specialist, he won the HEW Cyclassics in front of a home crowd in Hamburg in 1997, and had podium finishes in the hilly classic Clásica de San Sebastián. His victorious ride in the 1997 Tour de France led to a bicycle boom in Germany.

Ullrich won his first bicycle race at 11. He was educated in the sports training system of the German Democratic Republic attending the KJS sports school in Berlin in 1986. In 1988, he was champion of the German Democratic Republic. The school closed two years after the fall of the Berlin wall in 1989. He, his trainer Peter Sager, and teammates joined an amateur club in Hamburg until 1994. In 1991, he was 5th in the amateur cyclo-cross world championships.

In 1993, at the Hamburg club, Ullrich won the world amateur road championship in Oslo, as Lance Armstrong won the professional championship.

In 1994 with Becker as his agent, Ullrich turned professional for the Telekom team under Walter Godefroot. He finished third behind Chris Boardman in the world time trial championship in Sicily.

Ullrich was inconspicuous in his first 18 months as a professional . In 1995 he became national time trial champion. He also achieved top ten placings on stages of the 1995 Tour de Suisse. At 21 he wanted to start the 1995 Tour de France but Godefroot thought it was early. Instead he went to the small German stage race, the Hofbrau Cup, where he ended 3rd. Ullrich started the Vuelta later that year only to abandon on stage 12.

Ullrich gave up a place in the 1996 German Olympic team to ride his first Tour. He finished the prologue 33 seconds down. He stayed within the top 20 until the mountains on stage 7 when Miguel Indurain cracked. Ullrich finished 30 seconds back, 22 behind his teammate Bjarne Riis while Indurain finished four minutes down. On the following stage, he finished in the same group as Indurain 40 seconds behind Riis. On stage 9, Riis rode into the yellow jersey while Ullrich finished 44 seconds back and also into 5th place overall 1 minute 38 seconds from Riis.

Over the final mountains, Ullrich rode into second place behind Riis, but he conceded time on each mountain stage, eventually being nearly four minutes behind Riis. He won the final individual time trial and secured his first Tour stage win. He cut 2 minutes 18 seconds into Riis's lead . This led Indurain to comment that Ullrich would win the Tour some day, adding that it was a remarkable victory considering that Ullrich had been helping Riis. Ullrich dismissed suggestions he would have done better if he had not had to help Riis, saying Riis had inspired the team. Jan finished his first tour in second place at 1 minute 41 seconds from his teammate Bjarne Riis.

Ullrich had two wins before the 1997 Tour; a stage in the Tour de Suisse and the national Road Race championship a week before the tour. He became favorite in the 1997 Tour de France. He started strongly, finishing second in the prologue behind Chris Boardman. On stage 9, the first mountain stage which was won by Laurent Brochard, Ullrich worked for Riis. Only on the last ascent when Richard Virenque attacked did Ullrich react. Riis struggled to keep up and finished 30 seconds behind Virenque, Marco Pantani and Ullrich. On stage 10 from Luchon to Andorra Arcalis, with Riis again falling back, Ullrich dropped back to the teamcar to ask permission to attack. He returned to the lead group and pushed up the climb leaving Pantani and Virenque. He finished a minute ahead which earned his first yellow jersey. L'Équipe, greeted Ullrich with Voilà le Patron ("Here is the boss"). Ullrich won the Stage 12 time trial with three minutes between himself and the second placed rider, Virenque, who had started three minutes in front of him.

Marco Pantani attacked on the stage to the Alpe d'Huez. Ullrich, who was nine minutes ahead of Pantani overall, limited his losses to 47 seconds. Pantani attacked again on the Morzine stage and won, while Ullrich again limited his losses. In the final time trial, won by Abraham Olano, Ullrich extended his lead over Virenque and the following day became the first German to win the Tour de France. At 23, Ullrich was the fourth youngest winner of the Tour since 1947. Two weeks later, he won the Hews Cycling Classic in Hamburg. A further two weeks later Ullrich was beaten by Davide Rebellin in a sprint in the GP Suisse. He was chosen "sports person of the year" in Germany in 1997.