The 2017 NXT TakeOver: WarGames (originally NXT TakeOver: Houston) was the 17th NXT TakeOver and inaugural NXT WarGames professional wrestling livestreaming event produced by WWE. It was held exclusively for wrestlers from the promotion's NXT brand division. The event aired exclusively on the WWE Network and took place on November 18, 2017, at the Toyota Center in Houston, Texas as part of that year's Survivor Series weekend. The event's name is derived from the match of the same name that was originally used in the National Wrestling Alliance and later, World Championship Wrestling.

Five matches were contested at the event. In the main event, The Undisputed Era (Adam Cole, Bobby Fish, and Kyle O'Reilly) defeated Sanity (Alexander Wolfe, Eric Young, and Killian Dain) and the team of The Authors of Pain (Akam and Rezar) and Roderick Strong in a WarGames match. On the undercard, Ember Moon defeated Kairi Sane, Nikki Cross, and Peyton Royce in a fatal four-way match to win the vacant NXT Women's Championship, and Andrade Cien Almas defeated Drew McIntyre to win the NXT Championship.

During the NXT TakeOver: Philadelphia pre-show, TakeOver: WarGames won the NXT Year-End Award for "NXT TakeOver of the Year".

NXT TakeOver was a series of professional wrestling events that began in May 2014, as WWE's NXT brand held its second WWE Network-exclusive event, billed as TakeOver. In subsequent months, the "TakeOver" moniker became the brand used by WWE for all of its major NXT events. Announced on November 17, 2016, WarGames was scheduled as the 17th NXT TakeOver event. Originally promoted as TakeOver: Houston, as the event was held in Houston, Texas, the event was changed to TakeOver: WarGames after an announcement by Triple H on October 4, 2017. The event's name was derived from an old match type that was originally used in the National Wrestling Alliance, and later, an annual match held by World Championship Wrestling. The TakeOver event featured the namesake match, which was the first time in nearly twenty years since the match last occurred. The inaugural TakeOver: WarGames was held on November 18, 2017, at Houston's Toyota Center and was a support show for that year's Survivor Series pay-per-view (PPV).

The card included matches that resulted from scripted storylines. Results were predetermined by WWE's writers on the NXT brand, while storylines were produced on WWE's weekly television program, NXT.

On the September 6 episode of NXT, Asuka relinquished the NXT Women's Championship due to a legitimate injury she sustained at TakeOver: Brooklyn III; she was subsequently moved up to the main roster on the Raw brand. On September 12, Kairi Sane won the Mae Young Classic and earned herself a shot at the vacant NXT Women's Championship at TakeOver: WarGames. On the September 27 episode of NXT, General Manager William Regal made the match at WarGames a fatal four-way for the vacant NXT Women's Championship, with qualifying matches held over the following weeks to determine the other three participants. On the October 11 episode, Peyton Royce defeated Nikki Cross (of Sanity) and Liv Morgan to qualify for the match by pinning Cross after she was distracted by Taynara Conti, who was escorted by The Undisputed Era. The following week, Ember Moon qualified by defeating Ruby Riott and Sonya Deville. On the next episode, Nikki Cross last eliminated Billie Kay in a battle royal to qualify for the last spot in the fatal four-way. Cross later defeated Conti in a singles match on the November 1 episode. The following week, Sane defeated Kay in singles competition. The next week, after Moon defeated Mercedes Martinez, the other three competitors came to the ring and ringside area and stared each other down.

At TakeOver: Brooklyn III, Drew McIntyre defeated Bobby Roode to win the NXT Championship; Roode was then promoted to the main roster on the SmackDown brand. On the October 4 episode of NXT, McIntyre successfully defended his title against Roderick Strong. Two weeks later, Andrade Cien Almas's manager, Zelina Vega, interrupted McIntyre's interview, stating that Almas and McIntyre were the same, accusing him of avoiding Almas, and expressing Almas's interest in challenging him for the title. On the October 25 episode, Vega said that they had been waiting for a contract for an NXT Championship match with McIntyre, saying that McIntyre and Strong were weak compared to Almas. Almas then defeated Strong after Vega physically interfered in their match. Afterwards, Vega challenged McIntyre to meet Almas in the ring the next week. After the show went off the air, general manager William Regal, in a video posted to Twitter, announced that McIntyre versus Almas for the title had been made official and their confrontation next week would be a contract signing. On the November 1 episode, McIntyre signed the contract to defend his title at WarGames and brought it out to the ring, where Almas attacked McIntyre and signed the contract as well. McIntyre called Almas out on the November 15 episode, stating that Almas was taking orders from Vega and wondered if she would ever let him off his leash. Vega and Almas then came out and attacked McIntyre, standing tall with the title.

At TakeOver: Brooklyn III, Sanity (Alexander Wolfe and Eric Young) defeated The Authors of Pain (Akam and Rezar) to win the NXT Tag Team Championship. After the match, Bobby Fish and Kyle O'Reilly attacked all four competitors. Over the next several weeks, Adam Cole (who debuted at Brooklyn III by attacking newly crowned NXT Champion Drew McIntyre), Fish, and O'Reilly, now calling themselves "The Undisputed Era", and Sanity (including Killian Dain) brawled with each other after their respective matches. On the September 27 episode of NXT, Cole made his in-ring debut by defeating Young after Young was distracted with the faction brawl at ringside. The next week, after McIntyre successfully defended his title against Roderick Strong, The Undisputed Era came out to urge Strong to join them. On the October 18 episode, The Authors of Pain attacked Sanity during their match with Undisputed Era, holding up the tag titles and staring down Undisputed Era. The following week, after Strong's match with Andrade "Cien" Almas, Undisputed Era came down to the ring to convince Strong to join them, telling him to "think it over". On the November 1 episode, the Authors defeated Sanity by disqualification in their tag team championship rematch after they were attacked by The Undisputed Era, who beat up Sanity. Strong came out, teasing joining Undisputed Era, but attacked Cole instead, sending them running. General manager William Regal then came out and announced that in order to restore order, the three teams would face off in the only match that could contain them, a WarGames match, the first such match since the September 4, 2000, episode of WCW Monday Nitro, at TakeOver: WarGames. On the November 8 episode, Strong defeated Cole by disqualification after Fish and O'Reilly pulled him out of the ring. After the match, a brawl ensued between all three teams.