The Amazing Race 18

The Amazing Race 18 (also known as The Amazing Race: Unfinished Business) is the eighteenth season of the American reality competition show The Amazing Race. Hosted by Phil Keoghan, it featured eleven teams of two, each returning from a previous edition of the series, competing in a race around the world to win US$1,000,000. This season visited five continents and nine countries and traveled over 40,000 miles (64,000 km) during twelve legs. Starting in Palm Springs, California, racers traveled through Australia, Japan, China, India, Austria, Liechtenstein, Switzerland, and Brazil before returning to the United States and finishing in the Florida Keys. Elements introduced in this season include the automatic U-Turn for the last team to finish the first task. Elements of the show that returned for this season include the starting line task. This season was also the first to be filmed and broadcast for high-definition television. The season premiered on CBS on Sunday, February 20, 2011, and the finale aired on May 8, 2011.

Sisters Kisha and Jen Hoffman from The Amazing Race 14 were the winners of this season. They are the second all-female team & the first team of sisters to win The Amazing Race. Herbert "Flight Time" Lang and Nathaniel "Big Easy" Lofton of the Harlem Globetrotters from The Amazing Race 15 finished in second place, while father and daughter team Gary and Mallory Ervin from The Amazing Race 17 finished in third place.