I Love Lucy is a landmark American television sitcom starring Lucille Ball, Desi Arnaz, Vivian Vance, and William Frawley that ran from October 15, 1951, to May 6, 1957, on CBS. I Love Lucy was the most watched show in the United States in four of its six seasons, and was the first to end its run at the top of the Nielsen ratings (an accomplishment later matched only by The Andy Griffith Show in 1968 and Seinfeld in 1998). The show is still syndicated in dozens of languages across the world and remains popular with an American audience of 40 million each year. I Love Lucy is often regarded as one of the greatest and most influential sitcoms in history.