Sexual repression is a state in which a person is prevented from expressing their sexuality. Sexual repression is often associated with feelings of guilt or shame being associated with sexual impulses. What constitutes sexual repression is subjective and can vary greatly between cultures and moral systems. Many religions have been accused of fostering sexual repression.

Some analysts have mentioned that Christianity represses homosexuality, and have classified the doctrine of celibacy as sexually repressive.

Conservative forms of Islam are said to have strict sexual codes which include banning homosexuality, demanding virginity, and can require overly modest dress-codes for women.

Sigmund Freud was the first to use the term widely, and argued that it was one of the roots of many problems in western society. Freud believed that people's naturally strong instincts toward sexuality were repressed by people in order to meet the constraints imposed on them by civilized life. However, Freud's ideas about sexual repression have not been without their critics. According to sex therapist Bernard Apfelbaum, Freud did not base his belief in universal innate, natural sexuality on the strength of sexual desire he saw in people, but rather on its weakness.

Sigmund Freud (German pronunciation: [ˈziːkmʊnt ˈfʁɔʏt]), born Sigismund Schlomo Freud (6 May 1856 – 23 September 1939), was an Austrian neurologist who founded the discipline of psychoanalysis. Freud's family and ancestry were Jewish. Freud always considered himself a Jew even though he rejected Judaism and had a critical view of religion. Freud's parents were poor, but ensured his education. Freud was an outstanding pupil in high school, and graduated the Matura with honors in 1873. Interested in philosophy as a student, Freud later turned away from it and became a neurological researcher into cerebral palsy, Aphasia and microscopic neuroanatomy.

Freud went on to develop theories about the unconscious mind and the mechanism of repression, and established the field of verbal psychotherapy by creating psychoanalysis, a clinical method for treating psychopathology through dialogue between a patient (or "analysand") and a psychoanalyst. Though psychoanalysis has declined as a therapeutic practice, it has helped inspire the development of many other forms of psychotherapy, some diverging from Freud's original ideas and approach. Freud postulated the existence of libido (an energy with which mental process and structures are invested), developed therapeutic techniques such as the use of free association (in which patients report their thoughts without reservation and make no attempt to concentrate while doing so), discovered the transference (the process by which patients displace on to their analysts feelings based on their experience of earlier figures in their lives) and established its central role in the analytic process, and proposed that dreams help to preserve sleep by representing as fulfilled wishes that would otherwise awake the dreamer. He was also a prolific essayist, drawing on psychoanalysis to contribute to the interpretation and critique of culture.