The Rightly Guided Caliphs or The Righteous Caliphs (الخلفاء الراشدون al-Khulafā’u r-Rāshidūn) is a term used in Sunni Islam to refer to the first four Caliphs who established the Rashidun Caliphate. The concept of "Rightly Guided Caliphs" originated with the Abbasid Dynasty. It is a reference to the Sunni tradition, "Hold firmly to my example (sunnah) and that of the Rightly Guided Caliphs" (Ibn Majah, Abu Dawood).

The first four Caliphs who ruled after the death of Muhammad are often quoted as the Khulafah Rashidun.

The Rashidun were either elected by a council (see The election of Uthman and Islamic democracy) or chosen based on the wishes of their predecessor. In the order of succession, the rashidun were:

Hasan ibn Ali was appointed as Caliph in 661 following the death of Ali and is also regarded as a righteous ruler by Sunni Muslims, although he was recognized by only half of the Islamic state and his rule was challenged and eventually ended by the Governor of Syria, Muawiyah ibn Abi Sufyan.

The Rashidun Caliphate (Arabic: الخلافة الراشدية‎ al-khilāfat ar-Rāshidīyah), (c. 632-661) comprising the first four caliphs in Islam's history, was founded after Muhammad's death in 632 (Year 10 A.H. in the Islamic calendar). At its height, the Caliphate extended from the Arabian Peninsula, to the Levant, Caucasus and North Africa in the west, to the Iranian highlands and Central Asia in the east. At its greatest extent it was one of the largest empires in history. It is also known as the Patriarchal Caliphate.

After Muhammad's death in 632, the Medinan Ansar debated which of them should succeed him in running the affairs of the Muslims while Muhammad's household was busy with his burial. Umar (a Quraish) and Abu Ubaidah ibn al-Jarrah pledged their loyalty to Abu Bakr, with the Ansar and the Quraish soon following suit. Abu Bakr thus became the first Khalifa Rasul Allah (Successor of the Messenger of God), and embarked on campaigns to propagate Islam. First, though, he would have to subdue the Arabian tribes which had gone back on their oaths of allegiance to Islam and the Islamic community. As a Khalifa or Caliph he was not a monarch and never claimed such a title nor did his three successors do so.

Uthman ibn Affan (Arabic: عثمان بن عفان‎, strict transliteration: ʻUthmān ibn ʻAffān) (c. 579 – 17 July 656) was one of the companions of Islamic prophet, Muhammad. He played a major role in early Islamic history as the third of the Sunni Rashidun or Rightly Guided Caliphs.

Uthman was born into the Umayyad clan of Mecca, a powerful family of the Quraish tribe. He was a companion of Muhammad who assumed the role of leader (caliph) of the Muslim Empire at the age of 65 following Umar ibn al-Khattab. Under his leadership, the empire expanded into Fars in 650 (present-day Iran), some areas of Khorasan (present-day Afghanistan) in 651 and the conquest of Armenia was begun in the 640s. Some of Uthman's notable achievements were the economic reforms he introduced, and the compilation of the Qur'an into the unified, authoritative text that is known today.

Uthman was born in Ta’if, which is situated on a hill, and the presumption is that he was born during the summer months, since wealthy Meccans usually spent the hot summers in the cooler climate of Ta’if. He was born into the wealthy Umayyad (Banu Umayya) clan of the Quraysh tribe of Mecca, seven years after Muhammad. Uthman's father, Affan, died young while travelling abroad but left a large inheritance to Uthman. Uthman followed the same profession as his father, and his business flourished, making him one of the richest men among the Qurayshi tribe.

Abu Bakr (Abdullah ibn Abi Quhafa) (Arabic: عبد الله بن أبي قحافة, Transliteration: ʿAbd Allāh ibn Abī Quḥāfah, c. 573 CE - 634 CE) also known as Abū Bakr as-Șiddīq (Arabic: أبو بكر الصديق) was a senior companion (Sahabi) and the father-in-law of the Islamic prophet Muhammad. He ruled over the Rashidun Caliphate from 632–634 CE when he became the first Muslim Caliph following Muhammad's death. As Caliph, Abu Bakr succeeded to the political and administrative functions previously exercised by Muhammad, since the religious function and authority of prophethood ended with Muhammad's death according to Islam. He was called Al-Siddiq (The Truthful) and was known by that title among later generations of Muslims.

As a young man, Abu Bakr became a cloth merchant and he traveled extensively in Arabia and neighboring lands in the Middle East, through which he gained both wealth and experience. He eventually came to be recognized as the chief of his clan. On his return from a business trip to Yemen, he was informed that in his absence Muhammad had openly declared his prophethood. Not long after, Abu Bakr accepted Islam and was the first person outside the family of Muhammad to openly become a Muslim. He was instrumental in the conversion of many people to the Islamic faith and early in 623, Abu Bakr's daughter Aisha was married to Muhammad, strengthening the ties between the two men.