MM9 may refer to:

• Mega Man 9, a 2008 video game in the Mega Man series
• Might and Magic IX, a 2002 video role-playing game in the Might and Magic series
• MM9, standard used by the Multimedia Messaging Service in mobile networks, see MMS Architecture

• Frederick Hall (Normanton MP)
• Frederick Halsey
• Frederick Halstead Teese
• Frederick Halterman
• Frederick hamilton
• Frederick Hamilton Hauck
• Frederick Hamilton (soldier)
• Frederick Hanbury-Tracy
• Frederick Harer
• Frederick Harold Stewart
• Frederick harris
• Frederick Harris Music
• Frederick Hart
• Frederick Hart (sculptor)
• Frederick Hartt
• Frederick Haskell Dominick
• Frederick Hawksworth
• Frederick Hayday
• Frederick Hayek
• Frederick H. Borsch
• Frederick H. Chapin
• Frederick H. Christian
• Frederick H Christian
• Frederick H. Cocks
• Frederick H. Dominick