Qaṣr al-ʿĀmir Fayṣal bin Saʿad (Arabic: قصر الأمير فيصل بن سعد, romanized: Qaṣr al-ʿĀmir Fayṣal bin Saʿad) was a palace in Riyadh, Saudi Arabia.

It was built for Fayṣal bin Saʿad, the son of Sa'ad bin Abdul Rahman Al Saud, the latter a brother of King 'Abd al-'Aziz Ibn Saud.

The palace was located in palm gardens north of the old town, directly adjacent to Qaṣr al-Shamsīyya.

The building has been demolished and replaced by the King Abdulaziz Public Library and the General Court.

Gerald de Gaury, who was in Riyadh in the 1930s, illustrated the palace in his book Arabia Phoenix.