同性恋研究及治疗全国协会（英文：The National Association for Research & Therapy of Homosexuality，缩写：NARTH），成立于1992年，是美国的一个研究并致力于转变同性恋者的性倾向的团体。

同性恋研究及治疗全国协会反对美国心理学会1973年认定同性恋非心理疾病的结论。美国医学与科学界的多数团体和人士认为，转变治疗令人担心，并可能有害；而且有关的讨论高度政治化，双方互相指责研究动机及学者人品。

The National Association for Research & Therapy of Homosexuality (NARTH), also known as the NARTH Institute, is an organization that offers conversion therapy and other regimens that purport to change the sexual orientation of people with same-sex attraction. NARTH has been described by a Christian ministry group as a ministry partner that is "a multi-disciplinary professional and scientific organization dedicated to the service of persons who experience unwanted homosexual (same-sex) attractions (SSA)". NARTH was founded in 1992 by Joseph Nicolosi, Benjamin Kaufman, and Charles Socarides. Its headquarters are in Encino, California, at the Thomas Aquinas Psychological Clinic. Julie Hamilton is the current president of NARTH. NARTH's leaders disagree with the view of the world's major mental health organizations that homosexuality is not a disorder.