The 2017–18 Oklahoma City Thunder season was the 10th season of the franchise in Oklahoma City and the 52nd in the National Basketball Association (NBA). This season was headlined by the acquisitions of All-Stars Paul George and Carmelo Anthony in trades with the Indiana Pacers and New York Knicks respectively, in addition to the reigning MVP Russell Westbrook signing a five-year extension worth $205 million. The trio was dubbed the "Big Three" as well as "OK3". Thunder clinched their playoff berth for the eight time in the last nine seasons with a win over the Miami Heat on April 9, 2018.

They finished the regular season with 48–34, which clinched the 4th seed. In the playoffs, the Thunder faced the 5th seeded Utah Jazz in the First Round, a team led by rookie Donovan Mitchell, and lost in six games.

This season also marked the end of long-time veteran Nick Collison’s career, after 14 years. Sometimes referred to as “Mr. Thunder”, Collison appeared once in the finals (2012), and following his retirement, left Jeff Green of the Washington Wizards and Kevin Durant of the Golden State Warriors as the last remaining active players who played for the then-Seattle SuperSonics.

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