M.
- M.2.F. - Male "To" Female
- M.2.N. - Male "To" Neutral
- Malgender - To affirm someone's gender identity only to use it against them.
- Man - Someone who identifies as a man.
- Mastectomy - Removal of breasts.
- Maverique - A strong feeling of gender that is separate from that of being male, female, or neutral.
- Medical Tattooing - Tattoos which are used to cover up surgical scarring, or to otherwise make a body part to look more "normal."
- Medical Transition - When someone takes hormones (such as estrogen or testosterone) or undergoes surgery in the pursuit of gender euphoria.
- Menstrual Cup - A reusable product intended for collecting menstrual blood.
- Menstrual Disc - A reusable product intended for collecting menstrual blood.
- Metoidioplasty - A type of FTM bottom surgery.
- M.H.T. - Masculinizing Hormone Therapy
- Minoxidil - A substance used to stimulate hair growth.
- Mirdam - A gender neutral title that can be used in the same manner as words like sir or ma'am.
- Misgender - To refer to someone using the incorrect pronouns, name, or other gendered terminology.
- Mix - A gender neutral honorific that can be used in the same manner as words like mister or miss.
- M.O.G.A.I. - Marginalized Orientations, Gender identities, And Intersex
- M.P.B. - Male Pattern Baldness
- M.T.F. - Male To Female
- M.T.N. - Male To Neutral
- Mx. - The abbreviation of the honorific mix.
