A mechanic is a craftsman who uses tools to repair machinery.

Many mechanics are specialized in a particular field such as auto mechanics, bicycle mechanics, motorcycle mechanics, boiler mechanics,general mechanics, industrial maintenance mechanics (millwrights), air conditioning and refrigeration mechanics, aircraft mechanics, diesel mechanics, and tank mechanics in the armed services. Auto mechanics, for example, have many trades within. Some may specialize in the electrical aspects, while others may specialize in the mechanical aspects. Other areas include: brakes and steering, automatic or standard transmission, engine repairs or diagnosing customer complaints. An auto technician has a wide variety of topics to study.

A \"mechanic\" can also be a reference to a hired assassin as was portrayed in the movie The Mechanic (1972). Filmed in various locations, including Naples, Italy, The Mechanic movie was about an aging assassin who took a young student under him to teach him the trade. However, the Mechanic (the assassin) ends up \"seeing Naples and dying\".