Ahaitz or Ahaize is a Basque place name referring to flat areas in mountain, favorable to human settlement.^[1]

It may refer to:

• Ahaize, a hamlet of the commune of Ossès.
• Ahaxe, a commune of the Pyrénées-Atlantiques.

It is at the origin of place names as:

• Ahetze, a commune of the Pyrénées-Atlantiques and a former mande of Lower Navarre.
• Ahaizparren: Hasparren, Azparren, Asparren
• Aezkoa (Ahezcoa in 1137), a valley of Navarre.