Scott SmallsScott Smalls (played by Tom Guiry), simply called "Smalls" by the other kids, is a boy who moved to suburban Los Angeles in 1961 with his mother and his new step-father. The crux of the first half of the film is him trying to fit in with the kids of his new neighborhood. Taken under the wing of Benny, he finds a new passion for baseball. It is his mistake of unwittingly using a ball signed by Babe Ruth (which belonged to his step-father) that drives the second half of the film.
- Naïve Newcomer: Not just to the neigbhorhood but to the game itself. He doesn't even know who Babe Ruth is, which leads to the issue in the climax of the film.
- The New Guy: A kid that moved into the neighborhood of the Sandlot team. He needs everything explained to him and tries to fit in. They accept him primarily to fill an empty spot.
- Supporting Protagonist: While it's his story, Benny's the one who gets the most spotlight and is treated as The Hero. Considering Scott's admiration of Benny, it's only fitting.
Benjamin Franklin "Benny" RodriguezBenny (played by Mike Vitar) is the oldest, wisest and most mature of the Sandlot kids, and the one everyone looks up to. He is Hispanic, and a major fan of the Los Angeles Dodgers (he almost always wears a Dodgers ballcap). He is known particularly for his speed, and it comes into play when he outruns The Beast after getting Smalls' ball back in the second half.
Benny is the hero of the film, next to Smalls' Supporting Protagonist. In the Epilogue, he is revealed to have become a long-time pro baseball player, and is on the Dodgers at the end of the episode. It is suggested he had a very successful career, and is nicknamed "The Jet". Grown-up Benny is played by Pablo Vitar in the final scene of the film. He appears in The Sandlot: Heading Home, where he's the manager of the baseball team called the Dodgers.
- The Ace: He's a fantastic player, a great guy in personality, and so fast he can outrun The Beast.
- Ascended Fanboy: The only one of the kids to end up playing in professional baseball.
- Token Minority: The only named Hispanic character in the film.
Hamilton "Ham" PorterHam (played by Patrick Renna) is a bit of a snarker, and is not afraid to hurl insults or show off an inordinant amount of bravado. Although portly, he is a good power hitter on the actual team, and a home run by him (getting rid of their last ball for that day) introduces us to The Beast. He frequently tires of Smalls' naivete and lack of experience in certain things, like s'mores, frequently saying, "You're killing me, Smalls!"
In the epilogue, Ham is revealed to have become a professional wrestler.
- The Big Guy: The biggest guy on The Team and also the first to hit a homerun.
- Catchphrase: "You're killing me, Smalls!"
- Deadpan Snarker: The Catchphrase quote for instance, and many others.
Michael "Squints" PalledorousSquints (played by Chauncey Leopardi) looks like a nerd, but is also a good baseball player and a hammy storyteller. He is also a bit of a lech, having a major crush on an older local girl, Wendy Peffercorn. He largely drives the myths surrounding The Beast. In the epilogue, he's revealed to have bought the local pharmacy, and married Wendy. They have nine children.
- Babies Ever After: He and Wendy have enough kids together to field an entire baseball team by themselves.
- Hollywood Nerd: Scrawny and glasses looks the part but he's a ballplayer just as good as the others.
Alan "Yeah-Yeah" McClennanYeah-Yeah (played by Marty York) is a bit of a wise-cracker, and is known for starting a lot of his sentences by saying "Yeah-Yeah", hence his nickname.
- Verbal Tic: A characteristic phrase he says in every sentence? Yeah-Yeah, he has one.
Kenny DeNunezDeNunez (played by Brandon Quentin Adams), an African American, is the team's pitcher, and possibly the most devoted to baseball besides Benny. When he grows up, he plays minor league ball for awhile and he does inner-city little league organization.
- Ascended Fanboy: Partial. While not as successful as Benny he does go on to play baseball.
- Token Minority: The only African American kid of the Sandlot gang.
Bertram Grover WeeksBertram (played by Grant Gelt) also has the appearance of a nerd like Squints, but is much more low-key. In the epilogue, Smalls said he disappeared after getting "really into The '60s".
- The Generic Guy: Has no real defining characteristics of his own and seems to mostly be there to make up the numbers.
- "Where Are They Now?" Epilogue: What do you mean, "he got really in to The '60s, and no one ever saw him again"?
Timmy and Tommy "Repeat" TimmonsTimmy (Victor DiMattia) and Tommy (Shane Obedzinski) are brothers, Timmy being the older one. Tommy is the youngest of the Sandlot kids, and frequently repeats everything Timmy says. At the end, Smalls says they become an architect and a contractor and invented the mini-mall.
- Those Two Guys: They are brothers who exist as a narrative pair. Tommy doesn't do anything but repeat everything his older brother says.
The Beast and Mr. MertleThe Beast is an English Mastiff owned by Mr. Mertle, a blind elderly black man who lives behind the Sandlot where the kids play baseball. Known by the kids as "The Beast", he greedily hoards any ball hit over the fence. Although the kids think he's mean and evil, it turns out he just likes keeping the balls and is defensive about them. Really, he turns out to be a gentle giant, and at the end he's considered their mascot.
- Big, Friendly Dog: All the while the boys were fearing him and trying to get the ball back, he was playing with them. He licks Smalls at the first opportunity.
Mr. Mertle (played by James Earl Jones), his owner, is actually a former Negro Leagues baseball player, whose blindness cut his career short. He named his dog in honor of his former teammate Babe Ruth (who's considered the "Hercules of Baseball"). He befriends Smalls at the end. Smalls says at the end that Hercules lived to be 199 dog years old (about 28 1/2 years old).