Vacated on the September 25, 2007 edition of SmackDown! (aired September 28) by acting General Manager Vickie Guerrero, citing that his status as Mr. McMahon's (kayfabe) son and his dimunitive stature would eventually jeopardize his well-being.

This was a six-man Cruiserweight Open also involving Jimmy Wang Yang, Shannon Moore, Funaki and Jamie Noble.

This was an 8-man Cruiserweight Open at No Way Out, also involving Daivari, Shannon Moore, Funaki, Jamie Noble, Jimmy Wang Yang and Scotty 2 Hotty.

This was a six-way match also involving Funaki, Jamie Noble, Nunzio and Paul London. Helms, who was on the Raw roster at that time, moved to SmackDown! after winning the championship.

Won an 8-man battle royal.

Won the championship in a six-man Cruiserweight Open, also including Paul London, Akio, Shannon Moore and Spike Dudley.

This was a triple threat match also involving Spike Dudley.

Guerrero won the championship with one hand tied behind his back, though his father Chavo Classic untied it during the match.

This was a triple threat match that aired on May 16, also involving Billy Kidman.

The championship became the WWE Cruiserweight Championship on May 5 when the WWF became World Wrestling Entertainment.

The championship became the WWF Cruiserweight Championship when the WWF defeated The Alliance at Survivor Series on November 18 and replaced the WWF Light Heavyweight Championship. The championship became exclusive to SmackDown on March 25, 2002.

This was a unification match to seal X-Pac's WWF Light Heavyweight Championship.

WCW was purchased by the World Wrestling Federation later that month.

Sanders and Kevin Nash defeated Skipper in a Handicap Powerbomb match.

Skipper was awarded the championship by his Team Canada partner Storm, who called it the "100 KG and Under Championship".

Simultaneously held WCW Cruiserweight Championship, WCW United States Heavyweight Championship and WCW Hardcore Championship.

This was a triple threat match also involving Disco Inferno

Defeated Crowbar to become undisputed champion.

Defeated Candido and Tammy Lynn Sytch in a mixed tag team match to become co-champions on Monday Nitro.

Defeated The Artist, Juventud Guerrera, Shannon Moore, Lash LeRoux and Crowbar in a six-way match.

Vacated by Eric Bischoff and Vince Russo, along with all other WCW championships.

Vacated due to Oklahoma exceeding the weight limit

Became the first female Cruiserweight Champion

Was announced on Nitro to have defeated Lenny Lane during a house show match, however the match never took place. Later histories state Psychosis was awarded the championship on Monday Nitro for unexplained reasons.

Vacated due to Lenny Lane being stripped of the championship after Turner Broadcasting did not approve of the publicity garnered through Lane's homosexual gimmick.

This was a four-way match also involving Juventud Guerrera and Blitzkrieg.

Dean Malenko was the special guest referee.

Defeated Dean Malenko by disqualification. On July 12 at Bash at the Beach, Rey Misterio, Jr. defeated Jericho for the championship due to interference from Malenko; Jericho was returned the championship the following night.

Vacated due to Malenko not earning the championship shot as himself.

Malenko won a battle royal earlier in the night, wearing a mask as Ciclope, to earn a championship shot.

This was a Mask vs. championship match.

Jericho won the match at a house show that was broadcast over the Internet as Saturday Nitro.

This match was also for Dragon's J-Crown.

Defeated Wild Pegasus in tournament final to determine the new WCW Cruiserweight Champion.

Vacated due to knee injury. A tournament to decide the championship is scheduled, but never occurs.

Defeated Richard Morton in a tournament final to become the first WCW Light Heavyweight Champion. WCW did not recognize Light Heavyweight reigns as being part of the Cruiserweight championship's history. When WWE came into possession of the championship in 2001, they were added to its history.