In chemistry, halogenation is a chemical reaction that replaces a hydrogen atom with a halogen atom. More specific words exist that specify which halogen: fluorination, chlorination, bromination, and iodination.

Several types of halogenation exist:

• free radical halogenation
• ketone halogenation
• Electrophilic halogenation

See also

• Halogenoalkanes (Alkyl halides)
• Halogenoarenes (Aryl halides)
• Electrophilic substitution