Mariappa may refer to:

• Adrian Mariappa (born 1986), English-born Jamaican professional footballer who plays as a defender
• Mariappa Kempaiah (1932–2008), Indian footballer
• Mariappa Nagar, a place in Chidambaram, Cuddalore in India with pin code 608002
• Mariyappa First Grade College, a college in Basaveshwaranagar, Bangalore, India
• T. Mariappa, finance minister of Mysore State, India

• Richard Murray Simpson
• Richard Musgrave (economist)
• Richard Muspratt
• Richard Mustoe
• Richard Muther
• Richard Muther (art historian)
• Richard Muther (industrial engineer)
• Richard M. Webster
• Richard Myer
• Richard Myers (disambiguation)
• Richard Mylan
• Richard M. Young
• Richard Møller Nielsen
• Richard Møller-Nielsen
• Richard Mühlfeld
• Richard Nadeau
• Richard Naidu
• Richard Naiff
• Richard Nance
• Richard Nanes
• Richard Nanula
• Richard Napier Luce
• Richard Napier Luce, 1st Baron Luce
• Richard Nathaniel Hackett
• Richard Natonski