Updated January 2018
Since we have another UFC Inteirm championship fight announced this is a brief history of the UFC interim titles for each weight class:
The following weight classes have not yet had an Inteirm title:
Women's SW, flyweight BW or Featherweight & Men's Flyweight
Bantamweight:
Champion Dominic Cruz pulls out of a fight vs Faber at UFC 148, Renan Barao beats Faber at UFC 149 (after the fight is moved following Aldo's withdrawal from UFC 149) for the Inteirm title. Renan defended the interim belt two additional times before being promoted to full champion following Cruz pulling out of UFC 169.
Of note is that Cruz did eventually win the Bantamweight title by deafeating then champion TJ Dillashaw without having lost between regaining the belt and being striped of it.
Featherweight:
Champion Jose Aldo pulls out of a fight against Conor Mcgregor at UFC 189. Conor Mcgregor subsequently faces and defeats Chad Mendez at UFC 189 for the interim title. At UFC 194 Mcgregor beat Aldo to unify the title.
For unknown reasons the UFC announced that at UFC 200 - Champion Conor McGregor would rematch Nate Diaz at 170 LB (later rescheduled for UFC 202) while Aldo would face Frankie Edgar for the Inteirm title on that same card (this fight remained on UFC 200). Aldo defeated Edgar to become the Inteirm champion.
In November following Daniel Cormier pulling out of a LHW title fight vs Rumble Johnson ahead of UFC 206, the UFC announced that Conor McGregor would vacate the Featherweight title, Aldo would be promoted to full Champion and that the scheduled fight between Max Holloway and Anthony Pettis would be for the Inteirm featherweight title. Holloway defeated Pettis at UFC 206 and would go onto defeat Aldo at UFC 212 to unify the belt.
Lightweight
*of note is that BJ Penn vs Joe Stevenson at UFC 80 was announced as being for the interim lightweight title during Champion Sean Sherk's suspension and appeal following a failed drug test. Following Sherk's appeal the UFC stripped Sherk and the Penn/Stevenson fight became for the undisputed lightweight title
After it became apparent the Conor Mcgregor would not be fighting in the UFC in 2017, the UFC announced a Inteirm title fight between Tony Ferguson and Kevin Lee. At UFC 216 Tony Ferguson defeated Kevin Lee to become the inteirm champion. Subsequently it was announced that Ferguson would fight Khabib at UFC 223 for the undisputed title at which point Conor would be stripped of the belt. Ferguson pulled out of the fight a week out and Khabib ended up defeating Al Iaquinta for the undisputed title at which point Conor and Ferguson were stripped of their titles.
Welterweight
After Champion Matt Serra pulled out of a fight with Matt Hughes at UFC 79, the UFC announced a Inteirm title fight between Hughes and GSP at UFC 79. GSP subsequently won then unified the title by beating Serra at UFC 83.
After GSP pulled out a title fight with Nick Diaz at UFC 143, the UFC announced an interim title fight between Diaz and Condit. Condit beat Dias at UFC 143 but lost to GSP in the unification match at UFC 154.
Due to Tyron Woodley’s injuries, it was announced that at UFC 225 that Colby Covington would face RDA for the inteirm title. Colby won the bout, however he was stripped of the title a month later when it was determined that Woodley would be defending his belt at UFC 228 against Darren Till.
Middleweight
Due to Champion Michael Bisping's injury, the UFC announced a Inteirm title fight at UFC 213 between #1 contender Yoel Romero and Robert Whittaker. Whittaker beat Romeo but did not get the next title fight.
Bisping defendant the belt vs GSP and lost the belt. Shortly after winning the MW title, GSP vacated the title which resulted in Whittaker being promoted to champion.
After Whittaker was forced to pull out of his first title Defense against Luke Rockhold at UFC 221, the UFC announced that Rockhold will be fighting for an Inteirm title against Yoel Romero at that event. Romero won the bout but failed to make weight, preventing the title from being won. Romero did face Whittaker and lost by split decision, however he failed to make weight thus this bout was not a title match either.
Light Heavyweight
Due to a contractual dispute with champion Tito Ortiz the UFC announced an Inteirm title fight between #1 contender Chuck Liddell and former HW champ Randy Couture. Randy defeated chuck and subsequently Beat Tito at UFC 44 to unify the titles.
Following Daniel Cormier pulling out from a title fight against Jon Jones at UFC 197, the UFC announced a Inteirm title fight between Jones and OSP. Jones beat OSP at UFC 197 but was subsequently stripped of the belt due to failing a pre fight drug test prior to facing Cormier in a unification match. Jones did subsequently defeat Cormier in his next match at UFC 214.
Heavyweight:
Following injuries sustained by champion Frank Mir in a car accident, the UFC announced an interim title fight between Tim Sylvia and Andrea Arlovski. Arlovski won the title and defended it once prior to being promoted to full champion due to Mir's inactivity.
As a result of a contract dispute between the UFC and champion Randy Couture, the UFC announced an Inteirm title fight between Sylvia and Big Nog. Big Nog defeated Sylvia and was already signed to face Mir at UFC 92 prior to the announcement that Couture was rejoining the UFC.
Couture lost his heavyweight title to Lesnar at UFC 91 and Nog lost his Inteirm title ot Mir at UFC 92. In the unification bout, Lesnar defeated Mir at UFC 100.
Lesnar's subsequent health issues resulted in an Inteirm title being contested at UFC 111 between Mir and Shane Carwin. Carwin defeated Mir but lost the unification bout to Lesnar at UFC 116.
Following champion Cain Velasquez pulling out of UFC 180 in a title fight vs Fabricio Werdum, the UFC announced an Inteirm title fight between Werdum and Mark Hunt. Werdum defeated Hunt and subsequently unified the belts defeated Velasquez at UFC 188.
Since we have another UFC Inteirm championship fight announced this is a brief history of the UFC interim titles for each weight class:
The following weight classes have not yet had an Inteirm title:
Women's SW, flyweight BW or Featherweight & Men's Flyweight
Bantamweight:
Champion Dominic Cruz pulls out of a fight vs Faber at UFC 148, Renan Barao beats Faber at UFC 149 (after the fight is moved following Aldo's withdrawal from UFC 149) for the Inteirm title. Renan defended the interim belt two additional times before being promoted to full champion following Cruz pulling out of UFC 169.
Of note is that Cruz did eventually win the Bantamweight title by deafeating then champion TJ Dillashaw without having lost between regaining the belt and being striped of it.
Featherweight:
Champion Jose Aldo pulls out of a fight against Conor Mcgregor at UFC 189. Conor Mcgregor subsequently faces and defeats Chad Mendez at UFC 189 for the interim title. At UFC 194 Mcgregor beat Aldo to unify the title.
For unknown reasons the UFC announced that at UFC 200 - Champion Conor McGregor would rematch Nate Diaz at 170 LB (later rescheduled for UFC 202) while Aldo would face Frankie Edgar for the Inteirm title on that same card (this fight remained on UFC 200). Aldo defeated Edgar to become the Inteirm champion.
In November following Daniel Cormier pulling out of a LHW title fight vs Rumble Johnson ahead of UFC 206, the UFC announced that Conor McGregor would vacate the Featherweight title, Aldo would be promoted to full Champion and that the scheduled fight between Max Holloway and Anthony Pettis would be for the Inteirm featherweight title. Holloway defeated Pettis at UFC 206 and would go onto defeat Aldo at UFC 212 to unify the belt.
Lightweight
*of note is that BJ Penn vs Joe Stevenson at UFC 80 was announced as being for the interim lightweight title during Champion Sean Sherk's suspension and appeal following a failed drug test. Following Sherk's appeal the UFC stripped Sherk and the Penn/Stevenson fight became for the undisputed lightweight title
After it became apparent the Conor Mcgregor would not be fighting in the UFC in 2017, the UFC announced a Inteirm title fight between Tony Ferguson and Kevin Lee. At UFC 216 Tony Ferguson defeated Kevin Lee to become the inteirm champion. Subsequently it was announced that Ferguson would fight Khabib at UFC 223 for the undisputed title at which point Conor would be stripped of the belt. Ferguson pulled out of the fight a week out and Khabib ended up defeating Al Iaquinta for the undisputed title at which point Conor and Ferguson were stripped of their titles.
Welterweight
After Champion Matt Serra pulled out of a fight with Matt Hughes at UFC 79, the UFC announced a Inteirm title fight between Hughes and GSP at UFC 79. GSP subsequently won then unified the title by beating Serra at UFC 83.
After GSP pulled out a title fight with Nick Diaz at UFC 143, the UFC announced an interim title fight between Diaz and Condit. Condit beat Dias at UFC 143 but lost to GSP in the unification match at UFC 154.
Due to Tyron Woodley’s injuries, it was announced that at UFC 225 that Colby Covington would face RDA for the inteirm title. Colby won the bout, however he was stripped of the title a month later when it was determined that Woodley would be defending his belt at UFC 228 against Darren Till.
Middleweight
Due to Champion Michael Bisping's injury, the UFC announced a Inteirm title fight at UFC 213 between #1 contender Yoel Romero and Robert Whittaker. Whittaker beat Romeo but did not get the next title fight.
Bisping defendant the belt vs GSP and lost the belt. Shortly after winning the MW title, GSP vacated the title which resulted in Whittaker being promoted to champion.
After Whittaker was forced to pull out of his first title Defense against Luke Rockhold at UFC 221, the UFC announced that Rockhold will be fighting for an Inteirm title against Yoel Romero at that event. Romero won the bout but failed to make weight, preventing the title from being won. Romero did face Whittaker and lost by split decision, however he failed to make weight thus this bout was not a title match either.
Light Heavyweight
Due to a contractual dispute with champion Tito Ortiz the UFC announced an Inteirm title fight between #1 contender Chuck Liddell and former HW champ Randy Couture. Randy defeated chuck and subsequently Beat Tito at UFC 44 to unify the titles.
Following Daniel Cormier pulling out from a title fight against Jon Jones at UFC 197, the UFC announced a Inteirm title fight between Jones and OSP. Jones beat OSP at UFC 197 but was subsequently stripped of the belt due to failing a pre fight drug test prior to facing Cormier in a unification match. Jones did subsequently defeat Cormier in his next match at UFC 214.
Heavyweight:
Following injuries sustained by champion Frank Mir in a car accident, the UFC announced an interim title fight between Tim Sylvia and Andrea Arlovski. Arlovski won the title and defended it once prior to being promoted to full champion due to Mir's inactivity.
As a result of a contract dispute between the UFC and champion Randy Couture, the UFC announced an Inteirm title fight between Sylvia and Big Nog. Big Nog defeated Sylvia and was already signed to face Mir at UFC 92 prior to the announcement that Couture was rejoining the UFC.
Couture lost his heavyweight title to Lesnar at UFC 91 and Nog lost his Inteirm title ot Mir at UFC 92. In the unification bout, Lesnar defeated Mir at UFC 100.
Lesnar's subsequent health issues resulted in an Inteirm title being contested at UFC 111 between Mir and Shane Carwin. Carwin defeated Mir but lost the unification bout to Lesnar at UFC 116.
Following champion Cain Velasquez pulling out of UFC 180 in a title fight vs Fabricio Werdum, the UFC announced an Inteirm title fight between Werdum and Mark Hunt. Werdum defeated Hunt and subsequently unified the belts defeated Velasquez at UFC 188.
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