The idea in brief
Sunni and Shia Muslims share the core of Islam: one God, the Qur’an, the Prophet Muhammad, prayer, fasting, and pilgrimage. They differ chiefly over religious leadership after the Prophet, and from that follow differences in law, scholarship, and devotion.
Where the two traditions come from
After the Prophet Muhammad died in 632 CE, the community faced a question: who should lead? Most accepted Abu Bakr, a close companion, as the first caliph. Others held that leadership belonged to Ali, the Prophet’s cousin and son-in-law, and to his descendants. Over time these positions developed into the Sunni and Shia traditions.
The names reflect this history. “Sunni” is linked to ahl al-sunnah, the people of the Prophet’s example and the community. “Shia” comes from shi‘at Ali, the party of Ali. Roughly nine in ten Muslims today identify as Sunni; most of the remainder are Shia, with large communities in Iran, Iraq, Bahrain, Azerbaijan, Lebanon, and South Asia.
What both traditions share
Both affirm the testimony of faith, pray facing Mecca, fast in Ramadan, give zakat, and perform the pilgrimage. Both read the same Qur’an. Both honour the Prophet and his family and hold that worship belongs to God alone. A Sunni and a Shia Muslim can pray side by side in the same mosque, and many do.
Shared festivals, shared ethics, and a shared sacred history mean that the overlap is far greater than the differences. Many families and neighbourhoods include both, and many Muslims do not foreground the distinction in daily life.
Where they differ
The central difference concerns authority. Shia Islam holds that the Prophet designated Ali and that a line of divinely guided Imams from his family carried religious authority. Twelver Shia, the largest group, recognise twelve Imams; Ismaili and Zaydi Shia recognise different lines. Sunni Islam does not hold that leadership was divinely assigned to a family, and places authority in the Qur’an, the Sunnah, and scholarly consensus.
From this follow differences in hadith collections, legal schools, and devotional life. Shia Muslims commemorate the martyrdom of Husayn, the Prophet’s grandson, at Karbala in 680 CE during the month of Muharram. Some details of prayer posture and timing also differ. None of these differences changes the shared foundations described above.
Other groups you may hear about
Sufism is not a third sect but a dimension of devotion found among both Sunni and Shia Muslims, focused on remembrance of God, purification of the heart, and the guidance of a teacher. Ibadi Muslims, found mainly in Oman, form a small tradition older than the Sunni–Shia distinction in its present form.
Sunni Islam itself contains four major legal schools, and Shia Islam has its own. When you meet a label, ask what it refers to: a theology, a school of law, a political movement, or a cultural identity. These are often confused in news reporting.
Reading the differences fairly
Conflict between Sunni and Shia communities exists in some places, usually bound up with politics, nationalism, and power rather than with theology alone. In other places the two live together without tension. Neither story is the whole picture.
Qur’an 49:10 describes believers as a single brotherhood, and 3:103 calls them to hold together to the rope of God. Most Muslims, Sunni and Shia, read these verses as applying to one another.
Sources & further reading
- Qur’an 49:10 Believers described as one brotherhood.
- Qur’an 3:103 Holding together to the rope of God.
- Pew Research Center — The World’s Muslims: Unity and Diversity Survey data on Sunni and Shia identity and shared practice.
- Encyclopaedia Britannica — Shi‘i Historical overview of the Shia tradition.
Original introductory summary, not a direct scripture translation. Prepared 21 October 2026. Qualified human religious review is pending. About our editorial approach.