John O'Neil Farrell (August 28, 1906 – June 20, 1994) was an American speed skater and speed skating coach. Farrell participated in the 1928 Winter Olympics in St. Moritz. On the 500 m, he skated in the first pair and promptly set a new Olympic record with a time of 43.6 seconds, breaking Charles Jewtraw's old record of 44.0 seconds. The record would not stand, though, because in the next pair, Clas Thunberg skated 43.4 seconds, and in the eighth pair, Bernt Evensen also skated 43.4. But since nobody else besides those two skated faster than 43.6, Farrell won the bronze medal.