Thor Comic
What's the title of the comic when superheroes team up--like when Superman meets Batman and Spiderman?
What are the titles of these comics when superheroes gather together. There's a new movie coming out called Avengers which is like when Iron Man meets Captain America and Thor
Where to start?
You ask about Superman, Batman and Spiderman.
Superman and Batman are DC Comics properties. Spiderman is a Marvel Comics property, as are Iron Man, Captain America and Thor.
Generally these companies don't use each other's characters except under special circumstances. There are laws against that sort of thing.
In the DC Comics universe, there are plenty of team up comics, including The Brave and The Bold (Which was usually Batman and a different hero each month), The Justice League (Batman, Superman, Wonder Woman and a bunch of others), The Justice Society (Vintage heroes like the original Green Lantern and the original Flash and more), Teen Titans, The Outsiders, World's Finest, Batman Family, Superman Family, The New Gods and more.
Marvel has a similar stable of team themed titles like The Avengers, X-men, X-Factor, The Runaways, The Fantastic Four, The Inhumans, The Immortals and others.
Occasionally, DC and Marvel get together and team up popular characters in a single publication. For example, Spiderman and Superman met in the 70's (that was probably the first "crossover" ever), Batman has met The Punisher, Spiderman and Wolverine, Green Lantern met the Silver Surfer and so on. Google "Marvel, DC, crossover titles" and you'll find more info.
Not long ago, the two companies did an epic "Marvel Vs. DC" series that pitted popular characters from each universe in battle against each other to see which universe would ulitimately survive. Naturally, neither universe was destroyed, but the two companies created a combined label they called "AMALGAM" which published issues of comics with characters created by combining DC and Marvel heroes and villains. So, Batman and Wolverine combined to become "Dark Claw", Superman and Captain America became "Supersoldier" and so on. Single issues of various titles were published, mostly as a gag, since they generally ended with a cliffhanger and no issue beyond number one was ever published.
So there isn't any single title for a comic like you describe, but with 50 years of comics published and available both on paper and digitally, you can certainly find lots of team ups!
 3 MARVEL COMIC BOOKS THE MIGHTY THOR 346350363 US $5.99 
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 SAS Large Lot of 77 Comic Books Thor Hulk GI Joe Twilight Zone Many More US $19.99
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 THOR 1980s 1990s comics lot of 7 US $15.00
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 MARVEL COMICS LOT OF 18 BOOKS BULLET POINTS 1 5 TRUTH THOR ONE SHOTS SEIGE US $5.99
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 THOR 3 COMIC LOT S 167243295 FAIR VERYGOOD US $15.00
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 LOT OF 5 MIGHTY THOR COMIC BOOKS US $2.95
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Stuart Townsend Booted from 'Thor'
Thunder! Drama is already brewing on the set of "Thor"! Actor Stuart Townsend has been replaced by Joshua Dallas in the film adaptation of the comic book.