| Competition: | 1st America's Cup |
| Defender Country: | United States |
| Defender Burgee: | Burgee of the New York Yacht Club.svg |
| Defender Club: | New York Yacht Club |
| Defender Yacht: | 17 schooners, including Magic |
| Challenger Country: | United Kingdom |
| Challenger Flag Variant: | civil |
| Challenger Burgee: | Burgee of royal thames yc.svg |
| Challenger Club: | Royal Thames Yacht Club |
| Challenger Yacht: | Cambria |
| Location: | Newport, Rhode Island, United States |
| Dates: | 1870 |
| Winning Club: | New York Yacht Club |
| Score: | 1–0 |
| Next: | 1871 |
| Prev: | 1851 |
The 1870 America's Cup was the first America's Cup competition to be hosted in the United States,[1] and the first "America's Cup" due to the trophy being renamed from the 100 Guineas Cup of 1851. It was the first competition after the founding of the "America's Cup" event with the deed of gift in 1857.
James Lloyd Ashbury's yacht Cambria sailed to New York on behalf of the Royal Thames Yacht Club.
The New York Yacht Club entered 17 schooners, and the race was won by Franklin Osgood's Magic.The course of the race was from the Club House, Staten Island, N.Y. around the S.W. Spit to and the light ship off Sandy Hook and back, 40 miles. Seventeen American and the English yacht Cambria started at 11.21 A. M. The race was won by Magic, which rounded the home stake boat in 3 hours, 33 minutes, 54 seconds. The Yachts Tidal Wave, Widgeon, and Alarm failed to complete the race and were ruled out.
| Standing | Yacht | Cor. Time | Notes |
|---|---|---|---|
| Winner | 3h58'21" | ||
| 2nd | Idler | 4h09'35" | |
| 3rd | Silvie | 4h23'45" | |
| 4th | America | 4h23'51" | |
| 5th | Dauntless | 4h29'19" | |
| 6th | Madgie | 4h29'57" | |
| 7th | Phantom | 4h30'44" | |
| 8th | Alice | 4h34'15" | |
| 9th | Halcyon | 4h35'00" | |
| 10th | Cambria | 4h37'38" | |
| 11th | Calypso | 4h40'21" | |
| 12th | Fleetwing | 4h41'20" | |
| 13th | Madeleine | 4h42'35" | |
| 14th | Tarolinta | 4h47'29" | |
| 15th | Rambler | 4h48'33" | |