Amir, meaning "lord" or "commander-in-chief", is derived from the Arabic root a-m-r, "command". Originally simply meaning "commander”, it came to be used as a title of leaders, governors, or rulers of smaller states. In modern Arabic the word is analogous to the title “Prince". The word entered English in 1593, from the French émir.^[1] It was one of the titles or names of the Islamic prophet Muhammad.^{[citation needed]}

In the Bible, Deuteronomy 26:18 and in Isaiah 3:10, this word is used in Hebrew as a verb with a similar meaning.

• The monarchs of Qatar and Kuwait are currently titled emir.^[2][3][4]
• All members of the House of Saud have the title of emir (prince).^[5][6][7]
• Afghanistan under the government of the Taliban is officially an emirate, with the leader of the Taliban bearing the title Amir al-Mu'minin.
• The caliphs first used the title Amir al-Muminin or "Commander of the Faithful", stressing their leadership over the Islamic empire, especially over the militia. The title has been assumed by various other Muslim rulers, including sultans and emirs. For Shia Muslims, they still give this title to the Caliph Ali as Amir al-Muminin.
• The Abbasid (in theory still universal) Caliph Al-Radi created the post of Amir al-Umara ("Amir of the Amirs") for Ibn Raik; the title was used in various Islamic monarchies; see below for military use. In Iraq, the direct descendants of previous Emirs from the largest tribes, such as the Shammar and Khuza’ah tribes, who ruled the kingdoms before modern statehood, use the title of Sheikh or Prince as the progeny of royalty.^[8][9]
• Formerly in Lebanon, the ruling emir formally used the style al-Amir al-Hakim, specifying it was still the ruler's title. Note that the title was held by Druze and Christians as well.^{[citation needed]}
• The word emir is also used less formally for leaders in certain contexts. For example, the leader of a group of pilgrims to Mecca is called an emir hadji, a title sometimes used by ruling princes (as a mark of Muslim piety) which is sometimes awarded in their name. Where an adjectival form is necessary, "emiral" suffices.^{[citation needed]}
• Amirzade, the son (hence the Persian patronymic suffix -zade) of a prince, hence the Persian princely title mirza.
• The traditional rulers of the predominantly Muslim northern regions of Nigeria are known as emirs, while the titular sovereign of their now defunct empire is formally styled as the Sultan of Sokoto, Amir-al-Muminin (or Sarkin Musulmi in the Hausa language).^{[citation needed]}
• The temporal leader of the Yazidi people is known as an emir or prince.^{[citation needed]}
• Amīr al-Baḥr (أمير البحر, "commander of the sea") is considered to be the etymological origin of the English admiral, the French amiral and similar terms in other European languages.

From the start, emir has been a military title. In the 9th century the term was used to denote a ruler of a state i.e. Italy's Emirate of Sicily.

In certain decimally-organized Muslim armies, Amir was an officer rank. For example, in Mughal India, the Amirs commanded 1000 horsemen (divided into ten units, each under a sipah salar), ten of them under one malik. In the imperial army of Qajar Persia:

• Amir-i-Nuyan
• Amir Panj, "Commander of 5,000"
• Amir-i-Tuman, "Commander of 10,000"

The following posts referred to "amir" under medieval Muslim states include:

• Amir al-umara, "Amir of Amirs" (cfr. supra) or 'Commander of Commanders'
• Amir al-hajj, "Commander of the Hajj [caravan]"
• Amir al-ʿarab, "Commander of the Arabs [Bedouin tribes]"

In the former Kingdom of Afghanistan, Amir-i-Kabir was a title meaning "great prince" or "great commander".

Muhammad Amin Bughra, Nur Ahmad Jan Bughra, and Abdullah Bughra declared themselves emirs of the First East Turkestan Republic.

• Amir is a masculine name in the Persian language and a prefix name for many masculine names such as Amir Ali, Amir Abbas.
• Amir-i-Iel designates the head of an Il (tribe) in imperial Persia.
• The masculine Amir and feminine Amira are Arabic-language names common among both Arabs regardless of religion and Muslims regardless of ethnicity, much as Latin Rex and Regina ("king" and "queen," respectively) are common in the Western world. In Bosnia and Herzegovina, the female name Emira, often interpreted as "princess", is a derivative of the male name Emir.
• The masculine Amir and feminine Amira are Hebrew-language names that are relatively common in Israel. In Hebrew the word can also mean "bundle of grain" or "treetop" depending on the spelling.

Specific emirates of note

• List of emirs of Harar
• List of emirs of Kuwait
• List of emirs of Qatar
• List of emirs of Mosul
• Emirate of Afghanistan