The Rogues' car in the Coney Island confrontation was a 1955 Cadillac hearse. Originally, at the Coney Island confrontation at the end of the film, actor David Patrick Kelly wanted to use two dead pigeons but Hill did not think that would work. Instead, Kelly improvised by clinking three bottles in his right hand and ad-libbing his famous line, "Waaaaarriors, come out to plaaaay". Kelly was influenced by a man he knew in downtown New York who would make fun of him. Hill wanted Orson Welles to do a narrated introduction about Greek themes but the studio did not like this idea and refused to pay for it. However, this sequence was finally included in the 2005 Ultimate Director's Cut, with Hill providing the narration himself.

Film rights to Sol Yurick's novel The Warriors were bought in 1969 by American International Pictures but no film resulted.

Rights were then obtained by Producer Lawrence Gordon who commissioned David Shaber to write a script. Gordon had made Hard Times (1975) and The Driver (1978) with Walter Hill; he sent the script to Hill with a copy of Sol Yurick's novel. Hill recalls, "I said 'Larry, I would love to do this, but nobody will let us do it.' It was going to be too extreme and too weird."

Gordon and Hill were originally going to make a western but when the financing on the project failed to materialize, they took The Warriors to Paramount Pictures because they were interested in youth films at the time and succeeded in getting the project financed. Hill remembers "it came together very quickly. Larry had a special relationship with Paramount and we promised to make the movie very cheaply, which we did. So it came together within a matter of weeks. I think we got the green light in April or May of 1978 and we were in theaters in February of 1979. So it was a very accelerated process."

The film's Soundtrack, featuring music by Barry De Vorzon, Joe Walsh and others, was released on the A&M label in March 1979, the same year as the film. While The Warriors was adapted from a novel (itself adapted from the Ancient Greek text Anabasis by Xenophon), the film has been adapted as well. In 2005, Mezco Toyz released Warriors action figures, including Swan, Cleon, Cochise, Ajax, Luther, and a Baseball Fury.

The movie was first released on VHS in the 1980s and 1990s and DVD in 2001. The DVD contained the theatrical cut un-restored, this release has since fallen out of print. Then, in 2005, Paramount Home Video released the "Ultimate Director's Cut" DVD of The Warriors. Aside from a remastered picture quality and a new 5.1 surround remixed Soundtrack, the film has been re-edited with a new introduction and comic book-style sequences between scenes. In July 2007 the "Ultimate Director's Cut" was released onto Blu-ray and has since been available for online streaming rentals and purchases through Amazon, Apple's iTunes Store and Vudu.

Having scouted ahead on his own, Swan returns to the 96th Street station and finds Mercy there. More police show up and Swan and Mercy flee into the tunnel. They have an argument and Swan continues to Union Square where he reunites with the other Warriors. A fistfight ensues with the Punks in a public restroom which the Warriors win. Meanwhile, the Riffs are visited by a gang member who attended the earlier gathering and saw Luther shoot Cyrus.

Tony Scott had planned a remake of the film. In an interview in 2005, Scott said that the remake would be set in modern-day New York City; gangs such as the Baseball Furies and Hi-Hats would not be included in the remake. After the death of Scott, Mark Neveldine has been confirmed to take over the making of the remake.

Warner Bros. Entertainment released a downloadable title for the Xbox 360 titled The Warriors: Street Brawl. The game plays differently from the Rockstar Games version, being a side-scrolling brawler. In 2009, Dabel Brothers Productions began a five issue comic book adaption of the film. Following that was a four issue mini series entitled The Warriors: Jailbreak which takes place several months after the film's events.

Hill later reflected, "I think the reason why there were some violent incidents is really very simple: The movie was very popular with the street gangs, especially young men, a lot of whom had very strong feelings about each other. And suddenly they all went to the movies together! They looked across the aisle and there were the guys they didn't like, so there were a lot of incidents. And also, the movie itself is rambunctious — I would certainly say that."

In July 2016, Joe and Anthony Russo announced they were working with Paramount Television and Hulu for a re-imagined Warriors TV series; Frank Baldwin was signed on to write the series.

The Warriors has become a cult film, and some film critics have since re-examined it. As of December 1, 2017, the film has garnered a 89% approval rating at Rotten Tomatoes based on 35 reviews.

Finally, when the tension on set between Waites and Hill reached the breaking point, Hill demanded that stunt coordinator Craig Baxley improvise a stunt scene in which Waites' character would be killed. "Stunned, Baxley demurred. Such a critical scene would take careful planning. But Hill was insistent. 'I don’t give a shit how you kill him,' Baxley recalls the Director saying. 'Kill him.'" Baxley found a crew member who resembled Waites and staged a scene in which the character is thrown off a subway platform in front of an approaching train. “It was like someone cut my soul out and left a shell,” Waites remembers. He would later demand that his name be removed from the cast altogether; he remains uncredited to this day.