The October 23, 2009 Edition of Smackdown is a Professional wrestling television show of the WWE's Smackdown brand, which took place on October 20, 2009 at the Colonial Life Arena in Columbia, South Carolina.
- Numbers in parentheses indicate the length of the match.
- (c) refers to the champion(s) heading into the match.
- Matt Hardy, Finlay, R-Truth & The Hart Dynasty (Tyson Kidd & David Hart Smith) (w/ Natalya) defeated JTG, Dolph Ziggler, Eric Escobar & Drew McIntyre in a Four on Five Handicap match (9:30)
- John Morrison defeated Mike Knox (3:09)
- Batista & Rey Mysterio defeated Kane & Chris Jericho (10:00)
- Mickie James defeated Layla (2:45)
- The Undertaker (c) defeated CM Punk to retain the World Heavyweight Championship in a Submission match (11:38)
- Smackdown #531
- [Smackdown #531 on WWE Network]