An oblique proximal phalangeal osteotomy is introduced as an alternative to the Akin procedure for the treatment of hallux valgus. It consists of a single oblique osteotomy directed from proximal-dorsal to plantar-distal. A retrospective review of 32 patients who underwent 36 oblique proximal osteotomies is presented. The mean follow-up was 11 months (range, 3 to 21 months). Pre- and postoperative radiographic measurements of the distal articular set angles showed an average correction angle of 12 degrees (range, 7 degrees to 22 degrees; SD = 2.99). Mean range of first metatarsophalangeal joint motion was 82% of the preoperative value when combined with distal metatarsal osteotomy, and 87% of the preoperative value without a distal metatarsal osteotomy. Time to clinical and radiographic healing averaged 5 weeks (range, 4 to 8 weeks). The average amount of phalangeal shortening was 1 mm (range, 0 to 2 mm). There were no delayed or nonunions. Subjective assessment conducted by retrospective review of 19 patients at 6 months postoperatively showed that 17 were completely satisfied (90%), 1 was satisfied (5%), and 1 fairly satisfied (5%). Nineteen would have the surgery again (1 with reservations). Eighteen were very satisfied with appearance and 1 was improved. Fourteen returned to shoe gear at weeks 6 to 8, and 5 returned at weeks 8 to 12. Eighteen were satisfied with pain relief and 1 was improved. The study indicates that the oblique proximal phalangeal osteotomy is an effective, reliable, and technically simple procedure for correction of deformities of the proximal phalanx. The advantages include minimal shortening, ease of adjustability, and a construct conducive to rigid fixation.