The Mauritanian Party of Union and Change (Arabic: حزب الاتحاد والتغيير الموريتاني, romanized: ḥizb al-ittiḥād wat-taġyīr al-muritāni, French: Parti mauritanien de l'union et du changement), often known by its shortened Arabic abbreviation HATEM (Arabic: حاتم, romanized: ḥātm), is a political party in Mauritania.

It has been led since its foundation by Saleh Ould Hanenna.

The party stands on the right of the political spectrum, supporting civic nationalist, socially conservative and economically liberal policies while defending the role of religion in the Mauritanian state.

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