Muslims (Arabic: المسلمون, al-Muslimūn, transl. "Submitters [to God]") are people who adhere to Islam, a monotheistic religion belonging to the Abrahamic tradition. They consider the Quran, the foundational religious text of Islam, to be the verbatim word of the God of Abraham (or Allah) as it was revealed to Muhammad, the main Islamic prophet. The majority of Muslims also follow the teachings and practices of Muhammad (sunnah) as recorded in traditional accounts (hadith).

With an estimated population of almost 2 billion followers as of 1 January 2023 year estimation, Muslims comprise more than 25% of the world's total population. In descending order, the percentage of people who identify as Muslims on each continental landmass stands at: 45% of Africa, 25% of Asia and Oceania (collectively), 6% of Europe, and 1% of the Americas. Additionally, in subdivided geographical regions, the figure stands at: 91% of the Middle East–North Africa, 90% of Central Asia, 65% of the Caucasus, 42% of Southeast Asia, 32% of South Asia, and 42% of sub-Saharan Africa.

While there are several Islamic schools and branches, the two largest denominations are Sunni Islam (75–90% of all Muslims) and Shia Islam (10–20% of all Muslims). By sheer numbers, South Asia accounts for the largest portion (31%) of the global Muslim population, primarily across three countries: Pakistan, India, and Bangladesh. By country, Indonesia is the largest in the Muslim world, holding around 12% of all Muslims worldwide; outside of the Muslim-majority countries, India and China are home to the largest (11%) and second-largest (2%) Muslim populations, respectively. Due to high Muslim population growth, Islam is the fastest-growing religion in the world.