Taper may refer to:

• Part of an object in the shape of a cone (conical)
• Taper (transmission line), a transmission line gradually increasing or decreasing in size
• Fishing rod taper, a measure of the flexibility of a fishing rod
• Conically tapered joints, made of ground glass, commonly used in chemistry labs to mate two glassware components fitted with glass tubings
• Luer taper, a standardized fitting system used for making leak-free connections between slightly conical syringe tips and needles
• Tapered thread, a conical screw thread made of a helicoidal ridge wrapped around a cone
• Machine taper, in machinery and engineering
• Mark Taper Forum, a theatre in the Los Angeles Music Center
• A ratio used in aeronautics (see Chord (aeronautics))
• A thin candle
• Philadelphia Tapers (also New York Tapers and Washington Tapers), a defunct professional basketball team
• Taper (cymbal), the reduction in thickness of a cymbal from center to rim
• Taper pin, used in manufacturing
• Taper insertion pin, used in body piercing
• Taper (concert), a person who records audio concerts, usually via portable setup
• Taper, a type of men's haircut (see crew cut)