Thomas "Tom" Cat is a fictional character and one of the title characters (the other being Jerry Mouse) in Metro-Goldwyn-Mayer's series of Tom and Jerry theatrical cartoon short films. Created by William Hanna and Joseph Barbera, Tom is a blue/grey anthropomorphic domestic short-haired cat who first appeared in the 1940 animated short Puss Gets the Boot. Tom was originally known as "Jasper" during his debut in that short; however, beginning with his next appearance in The Midnight Snack he is known as "Tom" or "Thomas".

The domestic cat (Felis catus or Felis silvestris catus) is a small, typically furry, domesticated, and carnivorous mammal. They are often called house cats when kept as indoor pets or simply cats when there is no need to distinguish them from other felids and felines. Cats are often valued by humans for companionship and for their ability to hunt vermin. There are more than 70 cat breeds; different associations proclaim different numbers according to their standards. The International Progressive Cat Breeders Alliance (IPCBA) recognizes 73 cat breeds while TICA (The International Cat Association) recognizes 58, CFA (The Cat Fanciers' Association) recognizes 44 and Federation International Feline (FIFE) recognizes 43.

TOMCAT/SLIMCAT is an off-line chemical transport model (CTM), which models the time-dependent distribution of chemical species in the troposphere and stratosphere. It can be used to study topics such as ozone depletion and tropospheric pollution, and was one of the models used the IPCC report on Aviation and the Global Atmosphere [1]  It incorporates a choice of detailed chemistry schemes for the troposphere or stratosphere, and an optional chemical data assimilation scheme.

Tomcat may refer to:

• A male cat, known as a tom or tommiecat
• Rove beetle, also known as Tomcat in Indonesia