List of champions of the 1906 U.S. National Championships tennis tournament (now known as the US Open). The men’s tournament was held from 21 August to 29 August on the outdoor grass courts at the Newport Casino in Newport Rhode Island. The women’s tournament was held from 19 June to 23 June on the outdoor grass courts at the Philadelphia Cricket Club in Philadelphia PA. It was the 26th U.S. National Championships and the second Grand Slam tournament of the three played that year.