Nitro may refer to:

• Nitro functional group, a functional group with chemical formula NO₂
• Nitroglycerin, an extremely explosive chemical compound
• Glyceryl trinitrate (pharmacology), a medical compound used for the treatment of angina pectoris
• Nitrous, a type of fuel additives for race cars
• Nitromethane, or a fuel additive used especially in model cars
• Nitromagnesium, a fertilizer
• Nitro Records, an independent record label
• Nitro (roller coaster), a roller coaster at Six Flags Great Adventure
• WCW Nitro, an event in professional wrestling
• John Hennigan, known as Johnny Nitro a professional wrestler in World Wrestling Entertainment (WWE)
• Nitro (band), an 80s rock band
• Nitro, West Virginia, a city in West Virginia
• Nitro (computer game), a 1990 computer game
• Project Nitro, a codename for the Nintendo DS
• Nitro Snowboards, snowboard manufacturer
• Nitrogen, especially when used in draught beer
• Nitro (wireless networking), Conexant's proprietary enhancements to IEEE 802.11g wireless LAN performance
• Nitro - a song by LL Cool J
• Nitro, a Marvel Comics supervillain
• Danny Lee Clark, known as "Nitro" on the American Gladiators television show

ニトロ