A clean room suit, cleanroom suit, or bunny suit, is an overall garment worn in a clean room. One common type is an all-in-one coverall worn by semiconductor and nanotechnology line production workers, technicians & process / equipment engineers.

The suit covers the wearer to prevent skin and hair being shed into a clean room environment. The suit may be in one piece or consist of several separate garments worn tightly together. The suit incorporates both boots and hood. It must also incorporate a properly fitted bouffant cap.

More advanced designs with face covers were introduced in the 1990s (like the Intel fab worker-style suits seen on the Pentium processor product advertisements).

Since everyone looks alike in cleanroom suits, each person has their own set of suits, purchased to measure with a name tag or some other integral identification label.

Suits are usually deposited in a store after being contaminated for dry cleaning and/or repair.

Similar suits are worn in the contaminated areas of nuclear power plants. These suits consist of the main garment, hood, thin cotton gloves, rubber gloves, plastic bags over normal work shoes, and rubber booties. The wrists and ankles are taped down with masking tape. Occasionally a plastic raincoat is also worn. Removal of the garments (into several barrels) is a complicated process which must be performed in an exact sequence. Often a health physicist is present in the work area to observe good anti-contamination practices.