A character actor is an actor known for playing unusual or interesting characters in supporting roles. While all actors play "characters", the term character actor is often applied to an actor who frequently plays a distinctive and important supporting role. In another sense, a character actor may be also be one who specializes in minor roles. A character actor may play a variety of characters in their career, often referred to as a "chameleon", or may be known for playing the same type of roles. Character actor roles are more substantial than bit parts or non-speaking extras. The term is used primarily to describe television and film actors, as opposed to theater actors.

The term "character actor" is somewhat abstract and open to interpretation. Some definitions include:

• Playing unique, offbeat, colorful characters in supporting roles.
• Portraying individualities and eccentricities.
• Playing characters with eccentric personalities or looks.

Character actors are generally seen as less glamorous than leading actors, and they often have unusual looks or distinctive presences. Some character actors are instantly recognizable despite their names being little known. Over the course of an acting career, an actor can sometimes become difficult for audiences to recognize as being the same actor.