Kustoms are modified cars from the 1950s and early 1960s done in the customizing styles of that time period.

The usage of a "k" for "kustom" rather than a "C", is said to have originated from car builder George Barris. This style generally consists of starting with a 2-door coupe, lowering the suspension, chopping down the roofline, sectioning and/or channeling the body, and removing most of the body trim, door handles, etc. Paint jobs often were high gloss, just about every color was used, and this paint job was usually topped off with flames, scallops, or Von Dutch (Kenny Howard) or Dean Jeffries style pin striping.

These cars can also be referred to as custom cars, leadsleds or sleds. The term kustom is generally used as a signifier that the car was done in the 50s and early 60s style as opposed to later more modern styles.