"Clinicians should be aware that there is no evidence that sexual orientation can be altered through therapy, and that attempts to do so may be harmful. There is no empirical evidence adult homosexuality can be prevented if gender nonconforming children are influenced to be more gender conforming. Indeed, there is no medically valid basis for attempting to prevent homosexuality, which is not an illness. On the contrary, such efforts may encourage family rejection and undermine self-esteem, connectedness and caring, important protective factors against suicidal ideation and attempts. Given that there is no evidence that efforts to alter sexual orientation are effective, beneficial or necessary, and the possibility that they carry the risk of significant harm, such interventions are contraindicated."

"Confusion about sexual orientation is not unusual during adolescence. Counseling may be helpful for young people who are uncertain about their sexual orientation or for those who are uncertain about how to express their sexuality and might profit from an attempt at clarification through a counseling or psychotherapeutic initiative. Therapy directed specifically at changing sexual orientation is contraindicated, since it can provoke guilt and anxiety while having little or no potential for achieving changes in orientation."

"[T]he association does not consider homosexuality a disorder that requires treatment, and as such, we see no basis for [reparative therapy]. AAMFT expects its members to practice based on the best research and clinical evidence available."

"The College opposes the use of “conversion,” “reorientation,” or “reparative” therapy for the treatment of LGBTQ persons."

“The belief that same-sex attraction and behavior is abnormal and in need of treatment is in opposition to the position taken by national mental health organizations, including ACA. The ACA Governing Council passed a resolution in 1998 with respect to sexual orientation and mental health. This resolution specifically notes that ACA opposes portrayals of lesbian, gay and bisexual individuals as mentally ill due to their sexual orientation... In 1999, the Governing Council adopted a statement ‘opposing the promotion of reparative therapy as a cure for individuals who are homosexual.’...

[T]he ACA Ethics Committee strongly suggests that ethical professional counselors do not refer clients to someone who engages in conversion therapy or, if they do so, to proceed cautiously only when they are certain that the referral counselor fully informs clients of the unproven nature of the treatment and the potential risks and takes steps to minimize harm to clients. . . . This information also must be included in written informed consent material by those counselors who offer conversion therapy despite ACA’s position and the Ethics Committee’s statement in opposition to the treatment. To do otherwise violates the spirit and specifics of the ACA Code of Ethics.”

"Our AMA… opposes, the use of 'reparative' or 'conversion' therapy that is based upon the assumption that homosexuality per se is a mental disorder or based upon the a priori assumption that the patient should change his/her homosexual orientation."

"Psychotherapeutic modalities to convert or 'repair' homosexuality are based on developmental theories whose scientific validity is questionable. Furthermore, anecdotal reports of "cures" are counterbalanced by anecdotal claims of psychological harm. In the last four decades, "reparative" therapists have not produced any rigorous scientific research to substantiate their claims of cure. Until there is such research available, [the American Psychiatric Association] recommends that ethical practitioners refrain from attempts to change individuals' sexual orientation, keeping in mind the medical dictum to first, do no harm.

The potential risks of reparative therapy are great, including depression, anxiety and self-destructive behavior, since therapist alignment with societal prejudices against homosexuality may reinforce self-hatred already experienced by the patient. Many patients who have undergone reparative therapy relate that they were inaccurately told that homosexuals are lonely, unhappy individuals who never achieve acceptance or satisfaction. The possibility that the person might achieve happiness and satisfying interpersonal relationships as a gay man or lesbian is not presented, nor are alternative approaches to dealing with the effects of societal stigmatization discussed.

Therefore, the American Psychiatric Association opposes any psychiatric treatment, such as reparative or conversion therapy which is based upon the assumption that homosexuality per se is a mental disorder or based upon the a priori assumption that the patient should change his/her sexual homosexual orientation."

“As with any societal prejudice, bias against individuals based on actual or perceived sexual orientation, gender identity or gender expression negatively affects mental health, contributing to an enduring sense of stigma and pervasive self-criticism through the internalization of such prejudice.

Psychoanalytic technique does not encompass purposeful attempts to ‘convert,’ “repair,” change or shift an individual’s sexual orientation, gender identity or gender expression. Such directed efforts are against fundamental principles of psychoanalytic treatment and often result in substantial psychological pain by reinforcing damaging internalized attitudes.”

"THEREFORE, BE IT RESOLVED, That the American Psychological Association affirms that same-sex sexual and romantic attractions, feelings, and behaviors are normal and positive variations of human sexuality regardless of sexual orientation identity;

BE IT FURTHER RESOLVED, That the American Psychological Association reaffirms its position that homosexuality per se is not a mental disorder and opposes portrayals of sexual minority youths and adults as mentally ill due to their sexual orientation;

BE IT FURTHER RESOLVED, That the American Psychological Association concludes that there is insufficient evidence to support the use of psychological interventions to change sexual orientation;

BE IT FURTHER RESOLVED, That the American Psychological Association encourages mental health professionals to avoid misrepresenting the efficacy of sexual orientation change efforts by promoting or promising change in sexual orientation when providing assistance to individuals distressed by their own or others' sexual orientation…"

"Lesbian, gay, bisexual, transgendered and questioning (LGBTQ) youth often begin to experience self-identification during their pre-adolescent or adolescent years, as do heterosexual youth. These developmental processes are essential cognitive, emotional and social activities, and although they may have an impact on student development and achievement, they are not a sign of illness, mental disorder or emotional problems nor do they necessarily signify sexual activity.

‍The professional school counselor works with all students through the stages of identity development and understands this development may be more difficult for LGBTQ youth. It is not the role of the professional school counselor to attempt to change a student's sexual orientation/gender identity but instead to provide support to LGBTQ students to promote student achievement and personal well-being."

“[T]he American School Health Association... expects that comprehensive sexuality education in schools will be scientifically accurate and based on current medical, psychological, pedagogical, educational and social research... [and recommends] that teachers be well-trained and competent to teach sexuality education as defined by... insight into and acceptance of their own personal feelings and attitudes concerning sexuality topics so personal life experiences do not intrude inappropriately into the educational experience.”

“The most important fact about 'reparative therapy,' also sometimes known as 'conversion' therapy, is that it is based on an understanding of homosexuality that has been rejected by all the major health and mental health professions. The American Academy of Pediatrics, the American Counseling Association, the American Psychiatric Association, the American Psychological Association, the National Association of School Psychologists, and the National Association of Social Workers, together representing more than 477,000 health and mental health professionals, have all taken the position that homosexuality is not a mental disorder and thus there is no need for a 'cure.'”

"People seek mental health services for many reasons. Accordingly, it is fair to assert that lesbians and gay men seek therapy for the same reasons that heterosexual people do. However, the increase in media campaigns, often coupled with coercive messages from family and community members, has created an environment in which lesbians and gay men often are pressured to seek reparative or conversion therapies, which cannot and will not change sexual orientation. Aligned with the American Psychological Association's (1997) position, NCLGB [NASW's National Committee on Lesbian and Gay Issues] believes that such treatment potentially can lead to severe emotional damage. Specifically, transformational ministries are fueled by stigmatization of lesbians and gay men, which in turn produces the social climate that pressures some people to seek change in sexual orientation. No data demonstrate that reparative or conversion therapies are effective, and in fact they may be harmful."

Services that purport to "cure" people with non-heterosexual sexual orientation lack medical justification and represent a serious threat to the health and well-being of affected people, the Pan American Health Organization (PAHO) said in a position statement launched on 17 May, 2012, the International Day against Homophobia. The statement calls on governments, academic institutions, professional associations and the media to expose these practices and to promote respect for diversity.

“There is no sound scientific evidence that innate sexual orientation can be changed. Furthermore, so-called treatments of homosexuality can create a setting in which prejudice and discrimination flourish, and they can be potentially harmful (Rao and Jacob 2012). The provision of any intervention purporting to “treat” something that is not a disorder is wholly unethical.

WPA considers same-sex attraction, orientation, and behaviour as normal variants of human sexuality. It recognises the multi-factorial causation of human sexuality, orientation, behaviour, and lifestyle. It acknowledges the lack of scientific efficacy of treatments that attempt to change sexual orientation and highlights the harm and adverse effects of such “therapies”.”