WWE Unforgiven was an annual professional wrestling pay-per-view (PPV) event produced by World Wrestling Entertainment (WWE), a Connecticut-based professional wrestling promotion. It was first held as the 21st In Your House PPV in April 1998. Unforgiven returned as its own PPV in September 1999 and continued as the annual September PPV until the final event in 2008. From its first event up through the 2001 event, the PPV was held when the promotion was still called the World Wrestling Federation (WWF).

Unforgiven: In Your House was notable for featuring the very first Inferno match, as well as the first evening gown match. After WWE introduced the brand extension in 2002, Unforgiven from 2003 to 2006 was held exclusively for the Raw brand. Following WrestleMania 23 in April 2007, brand-exclusive PPVs were discontinued, thus the 2007 and 2008 events also featured the SmackDown and ECW brands. In 2009, Unforgiven was discontinued and replaced by Breaking Point.