National Ugly Mugs
| Red umbrella logo of National Ugly Mugs | |
| Abbreviation | NUM | 
|---|---|
| Formation | 2008 | 
| Founded at | Manchester | 
| Type | Nonprofit | 
| Headquarters | Manchester, England | 
| Region served  | United Kingdom | 
| CEO | Lynsey Walton | 
| Website | nationaluglymugs | 
| Formerly called | UK Network of Sex Work Projects | 
National Ugly Mugs (NUM) is a British charity best known for its "ugly mugs list" service that allows sex workers to share details of dangerous clients.
It was first established in 2008 as the UK Network of Sex Work Projects (UKNSWP), a charity based in Manchester that acted as an umbrella organisation representing sex work projects in the UK, both agencies or individuals working with sex workers. It facilitated networking between those it represents, so as to share good practice about providing quality support services for sex workers.
In July 2012 UKNSWP launched the National Ugly Mugs scheme, a national third party reporting system for sex workers that issues alerts to sex workers via their smartphone, and feeds intelligence to police, aiming to reduce offending by dangerous serial sexual offenders.
It was one of five winners of the Guardian Charity Awards 2014.
The charity was later renamed National Ugly Mugs, after the reporting system it founded.