No Nut November, often abbreviated to NNN, is an annual internet challenge of male sexual abstinence during the month of November. It originated in 2011 and grew in popularity on social media during and after 2017. Although No Nut November was originally intended to be satirical, some participants claim that abstaining from ejaculating and not watching pornography has health benefits. The challenge is associated with the NoFap community on Reddit, which encourages its members not to masturbate. The challenge has strict rules, including no sex, masturbation, or ejaculation in any way, shape, or form, and only one wet dream is allowed. Watching pornography and having boners are allowed, but participants cannot "nut". Destroy Dick December is a related internet challenge following No Nut November, which serves as a counterpoint, encouraging participants to take part in sexual activities such as intercourse and masturbation after abstaining from them during the previous month.

While some participants claim that abstaining from ejaculation and not watching pornography has health benefits, there is no scientific evidence to support these claims. In fact, frequent ejaculation is good for prostate health, and masturbation is a healthy behavior. Some No Nut November forums have been found to be misogynistic, homophobic, and antisemitic, and they incite violence towards pornographers and women who are sexual. Therefore, it is important to be aware of the potential negative consequences of participating in this challenge and to make informed decisions about whether or not to participate.