Hiss may be

• a phonetic element of a sibilant consonant, or of a lisp
• a verb close in meaning to whisper
• a noise characteristic of some snakes, or a different noise made for example by a cat
• an onomatopeic word for some noises, such as the release of air brakes, or the sound of irrigation sprinklers
• a category of noise, properly called white noise
• Alger Hiss U.S. State Department employee and alleged spy for the Soviet Union

Animal noises