The New Batman Adventures (often shortened as TNBA) is an American animated superhero television series based on the DC Comics superhero Batman, which aired on Kids' WB from September 13, 1997 to January 16, 1999. Produced by Warner Bros. Animation, it is a continuation of Batman: The Animated Series (1992–1995), serving as the third season of the show, and the third series in the DC Animated Universe. It was followed by Batman Beyond (1999–2001). The series was revamped from BTAS, replacing its art style with streamlined designs for more consistent animation, and to maintain similarity with the simultaneously running Superman: The Animated Series (1996–2000), with episodes airing on Kids' WB under the title The New Batman/Superman Adventures.

Stories in this series tend to give more focus to Batman's supporting characters, which include fellow crimefighters Robin, Nightwing and Batgirl, among others. The show also features guest characters such as Supergirl, Etrigan the Demon and The Creeper, characters who would later appear with Batman in Justice League and Justice League Unlimited. The 2001 video game Batman: Vengeance and its follow-up Batman: Rise of Sin Tzu are based on this series.

The New Batman Adventures premiered on Kids' WB just two years after Batman: The Animated Series ended its original run on Fox Kids. During the midst of working on Superman: The Animated Series, the network approached the creative team asking them if they could do more episodes of Batman, which would air alongside Superman. To freshen the look of the new show, the art style was revamped from Batman: The Animated Series for more consistent and fluid animation, as well as to keep similarity with Superman: The Animated Series. The show also had a significant change in focus from the original series, with episodes focusing less on Batman and more on the many characters that inhabited Gotham City.^[1]

Batman was given a sleeker, brawnier appearance with an overall darker costume: the yellow ellipse surrounding the bat emblem on his chest and the blue highlights of his cape and cowl were both removed and his utility belt has pouches instead of capsules and is now light brown instead of yellow, which resembles his appearance in Batman: Year One.^[1] His gadgets and vehicles were given a sleeker, redesigned look with a more black color scheme. Bruce Wayne's appearance was also changed from the previous series: his hair was brushed back to highlight his face, with blue eyes instead of black, and his regular business suit was changed from brown to black. Kevin Conroy's voice for Batman became more stern, as well as less distinguishable from his voice for Bruce than in the original series. The writers made an effort to keep Batman's dialogue as terse and grim as possible, in order to heighten the contrast between him and the lighthearted supporting cast; this also highlighted his character change from the original series.^[1]

Batgirl's costume was changed to a look similar to her original outfit from her comic debut in Detective Comics #359 and in her appearance in the Silver Age of comics, which is now a black bodysuit with yellow gloves and boots, but keeps her blue cape and cowl and yellow bat-symbol and utility belt. Her father Commissioner Gordon's appearance was also altered, with a more slender build and a flat-top hairstyle. Producer Paul Dini said that Batgirl would appear in every episode of the new series because "Kenner wants to do a line of toys, we're taking advantage of the publicity from her being in Batman & Robin, and we just love Batgirl".^[1] In addition, Melissa Gilbert was recast with Tara Strong (credited under her maiden name Tara Charendoff) as the voice of Batgirl, as the creative team wanted a younger-sounding voice. While Batgirl did not actually appear in every episode, she did appear more often than Batman's other partners in the series. She also was Batman's main partner in the series rather than Robin, which differs the series from most Batman television series and in the comics (as Robin is usually Batman's main partner).

Tim Drake was introduced as the new Robin in the episode "Sins of the Father". However, Dini remarked that "the Tim Drake origin in the comics as written now didn't work for us with him having a father and living so close to Wayne Manor. It seemed to work fine in the comics, but we needed our own little family unit of Batman, Robin, Batgirl and occasionally Nightwing – and Alfred of course". For these reasons, the production team came up with their own origin for Tim Drake, though they later realized this new origin was extremely similar to Jason Todd's.^[1] Dini and Timm later revealed that the new Robin was always intended to have Jason's origin story and characteristics of both Jason and Tim.^[2] The decision to implement some of Todd's characteristics on Drake came up after Timm and Dini decided to not adapt the violent "Batman: A Death in the Family" comic book storyline for the show.^[3] Batman made a new suit which is similar to the first one worn by Dick Grayson and identical to Tim Drake's original Robin costume from the comics, but the color scheme was simplified to red, black and yellow, eliminating green entirely. The costume retained the familiar red short-sleeved shirt, as well as the black cape with yellow inner lining. New elements included black sleeves, gloves, trunks and boots with red leggings. The familiar domino mask had also changed, giving the new Robin a more wide-eyed, innocent look. The color scheme would later appear as Tim Drake's Robin costume in the post-Infinite Crisis comics, while the original costume worn by Dick Grayson was seen in the flashback sequence of "Old Wounds" and in Barbara's nightmare sequence of "Over the Edge" where it is seen in the costume display before it gets destroyed by the Gotham Police.

Dick Grayson, having abandoned his Robin persona as a result of a falling out with Batman, adopted the identity of Nightwing. Grayson's build became sleeker, with broader shoulders, showcasing his emergence as a mature hero in his own right. The short spiky hair that Grayson wore as Robin had grown longer, styled to flow down the back of the neck. In his civilian guise, he wore it in a ponytail. As Nightwing, he wore a V-shaped mask and an all-black unitard with light blue hawk emblem that borrowed some elements of the comics version from the 1990s. The costume also featured collapsible wings under the arms that allowed Nightwing to glide for short distances.

The designs of most of the villains from Batman's rogues' gallery were also redesigned, some more so than others. The Joker's white skin now had a bluish-gray tinge, while the eyes had their scleras removed and were replaced by cavernous black spaces with white pupils. The ruby-red lips were gone, focusing more attention on the teeth, and the green-tinged hair was almost completely black. His flower pin color lighter orange was replaced with lime-green. His primary suit colors were changed from purple and orange (similar to his appearance from the 1989 Batman movie) to purple and green (similar to his appearance from the Golden Age and Silver Age comics); Joker's redesign was not well-received by fans, and this led to him being redesigned again for Batman Beyond: Return of the Joker (2000), Static Shock (2002) and Justice League (2002–04), where his appearance was a mix of his look from the original series and this one.^[4]

Catwoman's redesign now sported an all-black bodysuit (similar to her appearance from Batman Returns) and her hair is changed from blonde and shoulder-length to short and black while keeping her green eyes, matching her appearance in the comics. The Penguin's redesign resembled his appearance from the Golden Age and Silver Age comics instead of having the animal-like appearance from Batman Returns. The Riddler's redesign now sported a green bodysuit with a question mark in the center and his domino mask and red hair are removed, while his bowler hat is retained. The Scarecrow received a big change, both in design and personality, as he now has long black hair, black hat and dark gray trenchcoat and his face becomes dead-like. In addition, the character became much more serious and collected, speaking with a low, whispery voice. Henry Polic II was recast with Jeffrey Combs as the voice of the Scarecrow. Mr. Freeze's redesign is his suit now being black with metallic blue accents and his goggles have disappeared with his head now attached to a spider-like robot. Poison Ivy's appearance also changed, her skin tone is chalk white and her costume is now black with leaf-green highlights. Bane's redesign outfit is completely black with silver accents and his mask no longer has red lenses. Killer Croc received a major redesign, his skin is now reptilian green and his pants are now a blue-gray color. In addition, Aron Kincaid was recast with Brooks Gardner as the voice of Killer Croc.

Harley Quinn, Two-Face, Clayface, Alfred Pennyworth, and Harvey Bullock were among the few characters who did not receive any drastic change in appearance or color alterations. Harley Quinn is also the only villain aside from the Joker who appeared in six or more episodes. Ra's al Ghul and his daughter Talia also did not receive any drastic re-designs, although their only appearance during this time was in the episode "The Demon Reborn" from Superman: The Animated Series.

Koko Enterprise Co., LTD., TMS-Kyokuchi Corporation, and Dong Yang Animation Co., LTD contributed some of the animation for this series.

The Kids' WB censors were much more flexible with episode content than the Fox Kids censors were with Batman: The Animated Series. Producer Bruce Timm recounted that "when we were at Fox, after every single storyboard, we would get five single-spaced pages of notes on things we couldn't do. On the WB, we usually get maybe two paragraphs of stuff we can't do. At Fox, they were really picky, not just about things you couldn't do, but just in terms of content and story. They had a million opinions about what we should be doing. Nobody bothers us like that at the WB".^[1]

On December 6, 2005, The New Batman Adventures was released on DVD by Warner Home Video (via DC Entertainment and Warner Bros. Family Entertainment) under the title of Batman: The Animated Series - Volume Four (from The New Batman Adventures) to coincide with the previous three-volume DVD sets of Batman: The Animated Series.^[5] The series was released a second time on November 4, 2008, as part of a DVD release entitled Batman: The Complete Animated Series, which contained the episodes of all four volumes that were released in 2004/2005. The series has also been released for online media distribution services such as iTunes and Google Play specifically as "Season/Volume 4" of the complete animated series when the original two-season animated series was broken out differently into three seasons.^[6][7] The series was released on Blu-ray as part of Batman: The Complete Series in the fall of 2018.^[8]

It is subsumed as Season 3 of the original series when it debuted on HBO Max on January 1, 2021.

• Batman: Mystery of the Batwoman (2003), a direct-to-video release

• Batman: Vengeance, published by Ubisoft for the Game Boy Advance, PlayStation 2, GameCube, and Xbox consoles as well as Microsoft Windows; featuring the Joker, Harley Quinn, Mr. Freeze, and Poison Ivy as antagonists
• Batman: Rise of Sin Tzu, the sequel to Batman Vengeance, featuring original villain Sin Tzu
• Batman: Chaos in Gotham, a platforming action video game for the Game Boy Color
• Batman: Gotham City Racer, a racing game for the PlayStation

Capstone publishes children's chapter books containing illustrations with character designs from TNBA.^[9]

• Chase Me, a short silent film released as a bonus feature on the DVD of Batman: Mystery of the Batwoman
• Gotham Girls, Warner Bros' official series of Flash animations using many of the characters from the television series