NIMH may refer to:

• Nickel–metal hydride battery (NiMH), a type of electrical battery
• National Institute of Mental Health, an agency of the United States government
• National Institute of Medical Herbalists, a professional organisation in the United Kingdom
• Rats of NIMH, a series of children's books
• The Secret of NIMH, a 1982 animated film
• The Secret of NIMH 2: Timmy to the Rescue, a 1998 direct-to-video animated film

• All pages with titles beginning with Nimh
• All pages with titles beginning with NIMH
• All pages with titles containing NIMH