Ian K. Smith (born July 15, 1969) is an American physician, author, writer, medical correspondent and television host.

He is a former co-host of the Emmy award-winning syndicated daytime talk show, The Doctors. He also served as the medical/diet expert for six seasons on VH1’s highly-rated Celebrity Fit Club. In 2007, he launched the 50 Million Pound Challenge, a national weight loss initiative sponsored by CVS Pharmacy and State Farm, which he created and founded as well as another national health initiative The Makeover Mile.

Dr. Smith is the former medical correspondent for NBC News network and for NewsChannel 4 in New York, where he filed reports for NBC Nightly News and The Today Show as well as WNBC’s various news broadcasts. He has appeared extensively on various broadcasts including The Oprah Winfrey Show, The View, Dr. Oz, Steve Harvey Show, The Talk, Larry King Live, Anderson Cooper 360, CNN, MSNBC and many more.

He has written for various publications including Time, Newsweek, Men’s Fitness, and the New York Daily News, and has been featured in several other publications including, People, Redbook, Details Magazine, Essence, Ebony, University of Chicago Medicine on the Midway, Cosmopolitan, and Black Enterprise.

In 2010, Smith was appointed to the President's Council on Sports, Fitness, and Nutrition and he was appointed to a second term on the council by President Obama. He is the medical contributor and co-host of the nationally syndicated television show The Rachael Ray Show.

Smith hosts "HealthWatch with Dr. Ian Smith", a nationally syndicated daily news feature heard on American Urban Radio Networks. Smith has authored a number of books related to health and weight loss, as well as three crime novels.