- Mandamus
- Mandate
- Mandatory
- Mandatory Authority
- Mann Act
- Mann, Horace
- Mann, James Robert
- Manor
- Mansfield, William Murray, First Earl of
- Manslaughter
- Manufactures
- Mapp v. Ohio
- Marbury v. Madison
- Margin
- Margin Call
- Maris, Albert Branson
- Marital
- Marital Communications Privilege
- Maritime Lien
- Market Value
- Marketable Title
- Marque and Reprisal
- Marriage
- Marshal
- Marshaling Assets and Securities
- Marshall Plan
- Marshall, John
- Marshall, Margaret Hilary
- Marshall, Thurgood
- Martial Law
