Batman and Wonder Woman are two of DC's eponymous Trinity as well as two foundational members of the Justice League. They come from very different worlds--with Bruce Wayne being the billionaire orphan hailing from the crime-ridden urban hellscape of Gotham City and Diana being demigod royalty from the hidden island of Themyscira.
Despite those vastly different backgrounds, they've often found common ground in the Justice League, and they've had romantic brushes with one another across comics, cartoons, and film. Wonder Woman has had moments with both Superman and Batman over the years, but the prospect of Diana pairing off with Bruce has often stuck more prominently in fan imagination. It's almost happened a number of times.
10 A Rose In Legends Of The DC Universe
One of the tamer pieces of evidence of the flame that Batman and Wonder Woman hold for one another comes from Legends of the DC Universe #32. It's a relatively small gesture on the part of the Dark Knight. At this point, Bruce and Diana developed friction over their different approaches to administering justice. However, Bruce wanted to show Diana his great respect and admiration for her and gifted her a rose to show how he feels about her.
9 A Kiss In Brave And The Bold
A far earlier example of the flame between Bruce and Diana comes from Brave and the Bold #78, which we've actually talked about on CBR before. Batgirl and Wonder Woman are part of a convoluted ruse to trick the villainous Copperhead by pretending to be in love with Batman. It's weird and hard to explain beyond that, but it culminates in Wonder Woman and Batman sharing a real kiss. In that moment Diana develops real feelings for Batman that defuses by the end of the comic.
8 Charming In The Justice League Animated Series
A popular example of the bond shared by these two heroes comes from Paul Dini and Bruce Timm's Justice League and Justice League Unlimited. The episode that best exemplifies this is "This Little Piggy," which opens with Batman and Wonder Woman flirting while on a stakeout that's interrupted by the villain Circe.
She changes Wonder Woman into a pig, and much of the episode is spent watching the Justice League try to catch "Wonder Pig." In the end, Batman has to go on stage and sing his heart out to convince Circe to change Diana back.
7 Flirting In The DCEU Movies
That brings us to the DCEU films, where there has been some definite flirting between Batman and Wonder Woman. There was some energy between them in Batman V. Superman: Dawn of Justice for sure, and they came to rely on one another after Superman's apparent death between that film and Justice League on their route to creating the team.
6 Other Alternate Universe Romances
Injustice Gods Among Us finds the villainous Superman of the series dreaming of an ideal world where Batman and Wonder Woman marry, which implies that, on this alternate world, Superman saw something between them. Dark Nights: Metal implied that on several worlds throughout the multiverse Bruce and Diana fall in love--though the Batman Who Laughs has burned those worlds to cinders. Batman the Merciless in particular came from a world where he and Diana fell for one another before the latter was killed by Ares.
5 A Brief Moment Before Dying
Joe Kelly's JLA had a few moments that implied that there is something more between Bruce and Diana. One such moment came when Wonder Woman and Batman went to the Obsidian Age to stop the monstrous League of Ancients. Before charging to their apparent deaths, Bruce admits to Diana that he wishes he were perfect like her. It catches her off-guard, and the two share a kiss before charging into battle.
4 Perchance...
Later in Joe Kelly's JLA, Wonder Woman decides to explore the possibility of she and Batman sharing a romantic relationship...just, not in real life.
She uses an advanced machine owned by the Martian Manhunter to peer into a possible future where Diana and Bruce pair off, and this satisfies her curiosity. She decides to just remain friends and colleagues with Batman.
3 A Surprise Kiss In Trinity
Matt Wagner's run on Batman/Superman/Wonder Woman: Trinity gives an alternate telling of how the three heroes came to know one another, and Batman and Wonder Woman struggled to get along early on. They came to respect and understand one another. At one point, Batman sees Diana bathing on Themyscira, and he becomes so overcome that he kisses her shortly afterward. Diana punches Bruce in retaliation, but it's made explicit that this moment stuck with Bruce.
2 Love To The Rescue In Blackest Night
During the Blackest Night crisis, many heroes who were once dead began receiving Black Lantern rings from the undead Black Lantern Batman under the thrall of Black Hand and Nekron. One such ring came for Diana, as she had once experienced death and came back from it. However, she thought of her memories with Batman, and this attracted a nearby Star Sapphire ring (which is the Violet Lantern Corps which focuses upon the power of love) which recruited Diana into the Star Sapphire and saved her from the Black Lantern ring.
1 Trapped In An Alternate Reality Before The Wedding
Not too long ago, Batman was engaged to Catwoman. In the lead-up to the big wedding, Wonder Woman and Batman were called to an alternate universe to settle an old debt. They were to take over for a warrior who has committed to fighting "the Hordes of Gehenna" for all eternity. Bruce and Diana give this warrior a day of freedom while the two fight the Hordes on his behalf. However, a day in our world is years in his realm--even if one doesn't age in his realm. During this time, Bruce and Diana admit that they may have latent feelings for one another and almost kiss...but back away because of their commitments: Bruce to Selina and Diana to Steve Trevor.