Wing Commander is the first game in Chris Roberts' space flight simulation Wing Commander franchise by Origin Systems. The game was first released for MS-DOS on September 26, 1990, and was later ported to the Amiga, CD32 (256-color), Sega CD and the Super Nintendo Entertainment System, and re-released for the PC as Wing Commander I in 1994. An enhanced remake Super Wing Commander was made for the 3DO in 1994, and later ported to the Macintosh.

Two expansion packs for the game were released: Wing Commander: The Secret Missions in November 1990 and Wing Commander: The Secret Missions 2: Crusade in March 1991.

The game was considered a major step forward for space dogfight games, featuring graphics, audio, and a story campaign that invited comparison to the Star Wars films. Set in the year 2654 and characterized by Chris Roberts as "World War II in space", it features a multinational cast of pilots from the "Terran Confederation" flying missions against the predatory, aggressive Kilrathi, a feline warrior race (heavily inspired by the Kzinti of Larry Niven's Known Space universe).

Wing Commander is a space flight simulation game, with the player piloting a ship, completing missions, and engaging enemy ships of various capabilities. As the title suggests, there will generally be an AI-controlled wingman which the player can give orders to. Missions will generally include multiple objectives, but the game can proceed even if objectives are failed as long as the protagonist survives. The game features a branching, open-ended story where overall performance affects the campaign: succeeding at objectives results in medals, promotions in rank, and progressing to missions with better ships; failing at objectives leads to more difficult missions and piloting inferior ships. The mission tree is designed so players on the "losing" path could work their way back to the "winning" path, and conversely players on the "winning" path could fail subsequent missions to fall into the "losing" path. In addition, the wingmen can be killed permanently in combat, and thus be gone for the rest of the campaign.

The two Secret Missions expansion packs do not have a branching, open-ended story, and the player must successfully complete the core missions to win the game.

The player takes the role of a nameless pilot (later referred to as Christopher Blair in sequels) aboard the TCS Tiger's Claw, a Bengal-class Strike Carrier. The player names the pilot and chooses his call sign. The pilot, known in-production to Origin personnel as "Bluehair" after his most notable feature, quickly rises through the ranks of the flight wing. The campaign will split to various different planets and scenarios depending on the player's performance. If the player performs overall well, they eventually lead a strike on the Kilrathi High Command starbase in the Venice system and force the Kilrathi to retreat. If the player fails too many objectives, missions become increasingly defensive in nature. Human refugees abandon the sector, and eventually the Claw is forced to retreat as well. Of the two endings, the "winning" path is considered canon by the game's two expansion packs as well as the sequel Wing Commander II: Vengeance of the Kilrathi.

In the add-on's plot, the Tiger's Claw, on maneuvers in the Goddard System, receives an abortive distress call from Goddard colony. When the Claw arrives, though, nothing is left but wreckage and corpses; a quarter of a million colonists have been killed. Confed realizes that this is the work of a new Kilrathi weapon, the "Graviton weapon", which is able to increase the power of gravity by over a hundred times. Clever work by the Claw's crew and pilots allows them to capture a Kilrathi courier ship, which reveals that this weapon is mounted on an entirely new class of ship; CNC codenames it the Sivar-class dreadnought, after the Kilrathi god of war. Bluehair leads the strike against the Sivar and destroys it in the Vigrid system; for unexplained reasons, ships of that class and armament are never seen again.

In the add-on's plot, the Tiger's Claw is in the Firekka System, whose native intelligent lifeforms – the bird-like Firekkans – are negotiating to join the Terran Confederation. Tensions are high, and will only get higher. There is an unusual Kilrathi presence in the area, including their upgraded Dralthi II and ships that have never been seen before: the Hhriss-class heavy fighter and the Snakeir-class heavy carrier. This presence develops into a massive battle group, and though the Firekkans sign the Articles of the Confederation, the outnumbered Terrans have no choice but to retreat. Adding to the mess, a Kilrathi lord, Ralgha nar Hhallas, defects, bringing his Fralthi-class cruiser, the Ras Nik'hra, and word of a rebellion against the Empire on the Kilrathi colony of Ghorah Khar.