The abbreviations CH5, Ch5, and variations thereof may mean:

• CH⁺
  ₅, the chemical formula of methanium, an organic ion
• CH5 Deeside, part of the CH postcode area, Great Britain
• Bacteriocin CH5, an antibacterial produced by Lactobacillus acidophilus
• Chile Route 5, a highway in Chile
• C_H5, a type of cirrus cloud
• Channel 5 (disambiguation), a common name of television networks, channels and stations around the world
• 22291 Heitifer (1989 CH₅), a main-belt asteroid

This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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