Josh Koscheck is a retired welterweight fighter that fought for the UFC and Bellator MMA. He made his debut with the UFC the first season of the Ultimate Fighter. Koscheck fought for the UFC a record 25 times between 2005 and 2015.

Koscheck has a strong, well-documented base in collegiate wrestling, dating back to his years at Edinboro University of Pennsylvania, where he attended on an athletic scholarship. In 2001, during his junior season, Koscheck won all of his wrestling matches and went on to become the NCAA Division I Champion in the 174 lb weight class.

In addition to being a four-time NCAA Division I All-American (placing 4th, 2nd, 1st and 3rd respectively), Koscheck is a three-time recipient of the PSAC Wrestler of the Year award and he earned the Eastern Wrestling League Achievement Award twice.

Koscheck earned a Bachelor's degree in criminal justice from Edinboro University.  He spent a few months coaching at Erie Cathedral Prep and one and a half years as the assistant head wrestling coach at the University at Buffalo.

Koscheck appeared on the first season of The Ultimate Fighter as a middleweight fighter. He defeated Chris Leben via unanimous decision to advance to the semifinals, where he was defeated by Diego Sanchez via split decision. Koscheck had his first official UFC fight in April, 2005, at The Ultimate Finale, where he defeated Chris Sanford with a first round KO.

Koscheck followed that victory with another win at Ultimate Fight Night over UFC veteran Pete Spratt in Koscheck's debut at welterweight. Koscheck amassed three more victories after experiencing his first career loss to Drew Fickett due to a rear naked choke. Koscheck then defeated Canadian welterweight standout Jonathan Goulet at UFC Fight Night 6 by submission due to strikes.

Koscheck's fought in December, 2006 against Brazilian Jiu-Jitsu black belt Jeff Joslin at UFC Fight Night 7 where he won by unanimous decision.

Koscheck was then scheduled to fight Diego Sanchez in April, 2007 at UFC 69. This was the second encounter between the two welterweight fighters. The first fight did not count towards Koscheck's official record due to the bout being considered an exhibition match for The Ultimate Fighter television taping, resulted in a split decision win for Sanchez. At UFC 69, Koscheck defeated Sanchez by unanimous decision.

In August, 2007, Koscheck was defeated by Georges St-Pierre at UFC 74 via unanimous decision. Koscheck made his return at UFC 82, defeating Dustin Hazelett by TKO in the 2nd round. He won his next fight, against Chris Lytle at UFC 86, winning by unanimous decision.

Koscheck then agreed to step in and fight Thiago Alves at UFC 90 on just 2 weeks notice. Koscheck lost the fight via unanimous decision.

In December, 2008, Koscheck fought Yoshiyuki Yoshida in the main event at UFC: Fight for the Troops and won by KO in the first round. Koscheck received $60,000 bonus from the UFC for Knockout of the Night.

Koscheck fought promotional newcomer Paulo Thiago at UFC 95. Koscheck was defeated by the debuting Brazilian via first round KO. Koscheck returned at UFC 103 and defeated returning veteran Frank Trigg via TKO in the 1st round.

Koscheck was expected to face Mike Pierce on January 11, 2010, at UFC Fight Night 20, but instead went on to face Anthony Johnson at UFC 106. In November, 2009, Koscheck defeated Anthony Johnson by rear naked choke in the 2nd round.

Koscheck then signed to fight Paul Daley at UFC 113 in Montreal. Koscheck used his wrestling to earn a unanimous decision victory.

In 2010, Koscheck was a coach on The Ultimate Fighter season 12.

Koscheck faced Georges St-Pierre at UFC 124 for the UFC Welterweight Championship. UFC 124 was heavily hyped due to Josh's well known animosity towards St-Pierre, stemming from his loss by decision in their fight at UFC 74. St Pierre utilized his left jab effectively in the bout to defeat Koscheck by unanimous decision.

Koscheck defeated former UFC welterweight champion Matt Hughes in September, 2011 at UFC 135 via KO in the first round, replacing an injured Diego Sanchez.

Koscheck faced Mike Pierce at UFC 143 in February, 2012 and won the fight via split decision. Koscheck then faced Johny Hendricks on May 5, 2012 at UFC on Fox 3. He lost the fight via split decision.

Koscheck faced returning veteran Robbie Lawler in February, 2013 at UFC 157. Lawler defeated Koscheck via first round KO.

Koscheck next faced Tyron Woodley at UFC 167 in November, 2013. He lost the fight via knockout in the first round. 

Koscheck faced Jake Elllenberger at UFC 184 on February 28, 2015 where he lost in the second round by submission.

Just 21 days after his loss to Ellenberger, Koscheck replaced an injured Ben Saunders to face Erick Silva on March 21, 2015 at UFC Fight Night 62. Koscheck lost the fight by submission in the first round.

On June 26, 2015, it was announced that Koscheck signed a multi-year deal with Bellator MMA.

Koscheck was slated to fight Paul Daley at Bellator 158 in London on July 16 but pulled out of the fight after getting injured. 

It was announced on January 31, 2017, that Koscheck's previously delayed Bellator debut would take place at Bellator 172 on February 18, 2017 against Mauricio Alonso. He lost he fight via TKO in the first round.

Koscheck officially announced his retirement from MMA on June 28, 2018.