Andrew Michael Sullivan is a British blogger, author, and political commentator. He is a speaker at universities, colleges, and civic organizations in the United States, and a guest on national news and political commentary television shows in the United States and Europe. Born and raised in England, he has lived in the United States since 1984 and currently resides in Washington, D.C. and Provincetown, Massachusetts.

Sullivan is sometimes considered a pioneer in political weblog journalism, since he was one of the first prominent political journalists in the United States to start his own personal blog. Sullivan wrote his blog for a year at Time Magazine, shifting on 1 February 2007 to The Atlantic, where it received approximately 40 million page views in the first year. He is the former editor of The New Republic.