H20

{{Distinguish|H₂O}}

H20 (H twenty) may refer to:

• Highway H20 (Ukraine)
• HMS H20, a submarine
• McDonnell XH-20 Little Henry, a type of helicopter
• H20, Nvidia GPU
• Nissan H20, a type of engine
• Xi'an H-20, a Chinese subsonic stealth bomber
• Halloween H20: 20 Years Later, a 1998 horror sequel
• H20, the ICD-10 code for uveitis