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This article contains the list of characters featured in the Tom and Jerry animated series, given in the order of the era, they first appeared in.

Tom (originally called "Jasper") is a bluish grey and white domestic shorthair cat. He is usually, but not always, portrayed as living a comfortable and pampered life, while Jerry (originally called "Jinx"), a brown house mouse, is always living in close proximity to Tom. Despite being very energetic, determined, and much larger, Tom is no match for Jerry's wits. Jerry also possesses surprising strength for his size, sometimes even greater than Tom's, being able to lift items such as anvils with relative ease, and withstand big impacts. Although cats usually chase mice to eat them, it is quite rare for Tom to actually try to eat Jerry. Instead, he tends to compete with Jerry to taunt him (even as revenge) or to obtain a reward from a human (including his owner(s) or master(s)) for catching him or for generally doing his job as a house cat well. By the final "fade-out" of each cartoon, Jerry usually gets the best of Tom.

However, on rare occasions Tom triumphs over Jerry, and this usually happens when the latter pushes Tom a little too far, such as in The Million Dollar Cat, where Jerry learns that Tom will lose his newly acquired wealth if he harms any animal, "including mice." He then torments Tom a touch too much until he retaliates. In Timid Tabby, Tom's look-alike cousin pushes Jerry over the edge. Occasionally and ironically, sometimes they both lose, like when Jerry's final trap or attack on Tom backfires or he overlooks something, like in Filet Meow, where Jerry orders a shark from the pet store to scare Tom away from eating a goldfish, but finds himself entirely intimidated as well. They even occasionally end up being friends, although within this set of stories, the truce is often ruined by some last minute event. One story that has a friendly ending is Snowbody Loves Me.

Both characters display sadistic tendencies, usually taking pleasure in tormenting each other, although it is often in response to a triggering event. However, when one character appears to be in mortal danger from an unplanned situation, or due to actions by a third party, the other will develop a conscience and save him. Occasionally, the duo can bond over a mutual sentiment towards an unpleasant experience and their attacking each other is more of a game than serious. Multiple shorts show the two getting along with minimal difficulty, and they are more than capable of teamwork when the situation calls for it, usually against a third party who manages to torture and humiliate them both. These partnerships are usually forgotten about when an unexpected event happens, or when one character feels that the other is no longer necessary. This is the case in Posse Cat, when they agree that Jerry will allow himself to be caught if Tom agrees to share his reward dinner, but Tom then reneges. Other times, however, Tom does keep his promise to Jerry and the partnerships are not so quickly dissolved after a solution to the problem has been found.

Muscles Mouse has not been a contender in any CBUB matches.