List of royal families on the Arabian Peninsula in the 20th century

• Bahrain : House of Khalifa.
• Hejaz : Hashemites.
• Idrisid Emirate of Asir : Idrisid dynasty.
• Jabal Shammar : House of Rashīd : historical Arabian dynasty ruling Ḥa'il, northern Nejd.
• Kuwait : House of Sabah.
• Oman : House of Busaid.
• Saudi Arabia.
• Qatar : House of Thani, originally bedouin from Nejd.
• House of Al-Daweesh the ruling branch of the Mutayr tribe ruled Najd for a time
• United Arab Emirates – royal families:
• Yemen:
• * Federation of South Arabia : see list. Abolished in 1967 and replaced by the People's Democratic Republic of Yemen.
• * Mutawakkilite Kingdom of Yemen : House of Rass, abolished in 1970 after being defeated by the Yemen Arab Republic in the North Yemen Civil War.