Sexual harassment in the military is unwanted sexual behaviour experienced as threatening, offensive, or otherwise upsetting, which occurs in a military setting.

Sexual harassment is more common in military than civilian life. Military women and men experience unwanted behaviours disproportionately, particularly younger women and girls. Other groups at high risk include partners of personnel, child cadets, and military detainees.

Risk factors characteristic of a military setting include the young average age of personnel, isolated workplaces, the minority status of women, hierarchical power relationships, a culture of conformity, the predominance of traditionally masculine values and behaviours, and a heavy drinking culture. Harassment is particularly common in certain settings, notably centres for initial military training and theatres of war.

Experience of harassment can be traumatic. It increases the risk of stress-related mental illness, particularly post-traumatic stress disorder (PTSD). Nonetheless, typically most of those targeted choose not to raise a formal complaint, expecting repercussions if they do.

Despite the development of prevention programmes in recent years, official statistics in Canada, the United Kingdom and the United States report increasing rates of sexual harassment in the military.

Sexual harassment is unwanted sexual behaviour experienced as threatening or otherwise upsetting. Definitions in use by state armed forces include:

Sexual harassment in the military includes a broad spectrum of behaviour.

Undirected behaviours are those not personally targeted but which affect the working environment, such as sexist and sexual jokes and the prominent display of pornographic material.