Nicholas Scott Lachey (born November 9, 1973, in Harlan, Kentucky) is an American pop music singer who rose to fame in the mid-1990s as a writer and joint lead vocalist along with founding member Jeff Timmons of the band 98 Degrees. The group also included Lachey's brother Drew Lachey and classmate Justin Jeffre. They have sold over 10 million records worldwide and charted no fewer than 8 top 40 singles.

Lachey starred in the hit reality television series Newlyweds with his then-wife, fellow pop singer Jessica Simpson, which ran on MTV for two seasons from 2003 to 2005.

Following months of rumors and tabloid speculation, they announced their separation in November 2005, and were divorced in early 2006. On Friday, June 30, 2006, Lachey and Simpson's divorce became final.