Greenstein may refer to:

• 4612 Greenstein, a main-belt asteroid
• Greenstein (surname), a German surname

• Mad Cow-Girl
• Mad cow girl
• Mad Cow Theatre
• Mad Creek
• Mad-Croc Racing
• M.A.D.D.
• Madda (disambiguation)
• Maddagiri
• Maddale
• Maddalena (1953 film)
• Maddalena (1954 film)
• Maddalena Allegranti
• Maddalena de' Medici (1473-1528)
• Maddalena di Lorenzo de' Medici
• Maddalena insane asylum
• Maddalena lunatic asylum
• Maddalena (opera)
• Maddalena Passe o Pass
• Maddalena Sirmen
• Maddalena Tocco
• Maddalena Visconti
• MADD (disambiguation)
• Maddegama
• Maddela (disambiguation)
• Maddela Nagaraja Kumari