Monte Alto may refer to:

• Bernard de Monte Alto or Mowat (d.1306), Scottish knight and brother of William
• William de Monte Alto or Mohaut (d.1327), Scottish nobleman and brother of Bernard
• Eustace de Montaut or Monte Alto or Montalt (c.1027–1112), Breton soldier and English nobleman
• Hugh de Montaut or Monte Alto or Montalt (c.1050–1130), English nobleman

• Monte Alto culture, an archaeological site on the Pacific Coast in what is now Guatemala
• Monte Alto, São Paulo, a municipality in the state of São Paulo, Brazil
• Monte Alto, Texas, United States
• Monte Alto Protected Zone, in Costa Rica
• Mount Alto, Kilkenny, a County Kilkenny hill, Ireland

• Montalt (disambiguation)
• Montaut