WAF may refer to:
- Waf, a software build system written in the Python programming language
- WAF1, a protein implicated in p53 transcriptional regulation
- Weather and Forecasting, an American Meteorological Society journal
- Web application firewall, a proxy device with protocol awareness of HTTP
- Web application framework, a software framework that is designed to support the development of dynamic websites, Web applications and Web services
- Welsh Automotive Forum
- Wife acceptance factor (or wife approval factor or wife appeal factor), a colloquialism used in discussions related to hi-fi and home theater equipment
- Women in the Air Force (WAF), organized in 1948 and active until 1976
- Workers Autonomous Federation, one of several underground trade unions in the People's Republic of China
- World Apostolate of Fátima
- World Architecture Festival