Cyber Sunday was the fifth annual and final Taboo Tuesday/Cyber Sunday professional wrestling pay-per-view (PPV) event produced by World Wrestling Entertainment (WWE). It was held for wrestlers from the promotion's Raw, SmackDown, and ECW brand divisions. The event took place on October 26, 2008, at the US Airways Center in Phoenix, Arizona. The theme of the event was that fans could vote on certain aspects of every match. While it was the fifth event in this interactive PPV's chronology, it was the third titled Cyber Sunday as the first two events were titled Taboo Tuesday. In 2009, Cyber Sunday was replaced by Bragging Rights.

Eight professional wrestling matches and one miscellaneous segment were featured on the event's card. The event received 153,000 pay-per-view buys, less than the previous year's event. It was also the first Cyber Sunday PPV broadcast in high definition.