Batwoman (Katherine Rebecca "Kate" Kane) is a superheroine appearing in American comic books published by DC Comics. Created by writers Greg Rucka, Geoff Johns, Grant Morrison, Mark Waid, and artist Alex Ross, Kane is a wealthy heiress who becomes inspired by the superhero Batman and chooses, like him, to put her wealth and resources toward a campaign to fight crime as a masked vigilante in her home of Gotham City as Batwoman.

This current version of Batwoman, who shares the same name as her counterpart from the Silver Age of comics, debuted in 2006 in the seventh week of the publisher's year-long 52 weekly comic book. Introduced as Kate Kane, the modern Batwoman began operating in Gotham City in Batman's absence following the events of the company-wide crossover Infinite Crisis (2005). The modern Batwoman is written as being of Jewish descent and as a lesbian. During the New 52, it is established that Kate Kane is a cousin of Batman's alter-ego Bruce Wayne, being a niece of his mother Martha Wayne. Described as the highest-profile gay superhero to appear in stories published by DC, Batwoman's sexual orientation drew wide media attention following her reintroduction, as well as both praise and criticism from the general public.

The modern character is depicted in comics works relatively independently of Batman but has gained a considerable profile in recent years, both within the DC Comics publishing schedule and the publisher's fictional universe. She since had several runs in her own eponymous Batwoman monthly comic book and has had stints in the lead role in Detective Comics, the flagship Batman comic book for which DC Comics is named.

Kane appeared in media set in the Arrowverse, initially portrayed by Ruby Rose and later by Wallis Day.

The limited series Infinite Crisis (2005), written as a sequel to the 1985 maxi-series Crisis on Infinite Earths, altered DC Comics continuity. Subsequently, all comic book titles published by DC Comics skip forward one year and a new maxi-series entitled 52 retroactively chronicles the 52 weeks which directly followed Infinite Crisis. When DC editors called for a redesign of Batwoman, comic book artist Alex Ross drew inspiration from the modified Batgirl costume he designed for Barbara Gordon, seven years before Kate Kane's debut in the limited comic book series 52. Ross and comic book author Paul Dini initially planned to revive the former Batgirl Barbara Gordon using an updated version of the character's original costume, with red accents in place of the traditional yellow. However, since Gordon served as one of a very small number of disabled superheroes of DC Comics as Oracle, DC's editorial staff was against revitalizing her at the time. In an interview with Newsarama, Ross states, "They had me change the mask and hair to make it a bit more Batwoman, rather than Batgirl...I pointed out to them that the mask makes her look like the Huntress a little overall—but there weren't many options."

Unlike the Silver Age Kathy Kane, who was romantically attracted to Batman, the new version of Kane is a lesbian, as well as Bruce Wayne's maternal cousin. Her sexual orientation was announced at the same time the character was revealed in the spring of 2006. Stories appeared on television news outlets such as CNN, general news magazines such as USA Today, and gay culture magazines such as Out. The modern Katherine "Kate" Kane made her first comic book appearance in issue #7 of the maxi-series 52, where Kane is revealed to have been romantically involved with Renee Montoya, a former Gotham City Police detective (who later takes up the mantle of the Question after the original hero dies). When questioned about the editorial decision to make Batwoman a gay character in an interview with Wizard Entertainment, DC Comics Senior Vice President and Executive Editor Dan DiDio stated "It was from conversations we've had for expanding the DC Universe, for looking at levels of diversity. We wanted to have a cast that is much more reflective of today's society and even today's fanbase. One of the reasons we made her gay is that, again when you have the Batman Family—a series of characters that aren't super-powered and inhabit the same circle and the same city—you really want to have a point of difference. It was really important to me to make sure every character felt unique."

Batwoman's sexual orientation initially gathered mixed reviews, ranging from praise to outrage. A reviewer at Out asserts "Batwoman will be the highest profile gay superhero to ever grace the pages of DC Comics." Although several LGBT organizations such as GLAAD have praised DC Comics for attempting to diversify their characters, some have observed that Batwoman is not the first gay or lesbian character to appear in comic books, nor is she the only lesbian to be associated with the Batman series.

In the character's civilian identity as a socialite, Katherine Kane is acquainted with Bruce Wayne and is friends with a doctor named Mallory. She is presented with porcelain white skin, several tattoos, and a clothing style defined as punk-psychobilly-goth in her civilian persona. Her father is an Army colonel, and in Detective Comics #854, it is stated she is the cousin of Bette "Flamebird" Kane. The younger Kate also has a stepmother named Catherine Kane, making Catherine the aunt of Bette. At the 2008 New York Comic Con, it was announced that Batwoman would be among the characters appearing in a new Justice League comic book written by James Robinson. That year, Batwoman briefly took over as the lead character in Detective Comics, starting with #854. with DC saying at the 2009 New York Comic Con that she would be DC Comics' highest-profile gay superhero.