Islam en Turquiethumb|275px|La mosquée Bayezid II, à Istanbul. L’islam est présent dans la région de l'actuelle Turquie depuis la seconde moitié du , lorsque les seldjoukides ont commencé à s'étendre depuis l'Est vers l'Anatolie orientale. C'est la religion très majoritaire de la Turquie, où l'on estime que 83 % de la population est musulmane mais la constitution reste laïc. L'islam n'est pas religion d’État, contrairement aux pays musulmans. On estime qu'environ 80-85 % des musulmans sont sunnites, et 15-20 % sont chiites.
IshikismIshik or Ishik Alevism (Işık Aleviliği), also known as Chinarism (Çınarcılık), is a new syncretic religious movement among Alevis who have developed an alternative understanding of Alevism and its history. These alternative interpretations and beliefs were inspired by Turkish writer Erdoğan Çınar with the publication of his book Aleviliğin Gizli Tarihi (The Secret History of Alevism) in 2004.
SulaymaniThe Sulaymani branch of Tayyibi Isma'ilism is an Islamic community, of which around 70,000 members reside in Yemen, while a few thousand Sulaymani Bohras can be found in India. The Sulaymanis are sometimes headed by a Da'i al-Mutlaq from the Makrami family. It is not correct that this branch is headed by one from the Makrami family always as the D'ai al Mutlaq could be from other families and communities. Examples: the first Da'i was Dhuayb Bin Mousa (Hamdan), Dawud Bin Ajab Shah(Indian), Sulayman Bin Al Hassan (Indian) and some of his brothers and sons were Indians.
Bektashism and folk religionFolk religious practices remain in the Bektashiyyah tariqa and certain practices are also found to a lesser extent in Balkan Christianity and non-Bektashi Balkan Islam as well, according to some Western Islamic scholars. IslamChristianity and Paganism Famous archaeologist Arthur Evans, after studying ancient religions of Europe, noted that there were cults centered around the use of trees and pillars, often acting like . While in Macedonia he entered a temple/shrine that was maintained by Dervishes in the town of Tekekioii (possibly the tekke in modern Tetovo).
Alévismevignette|droite|240px|Ali ibn Abi Talib, compagnon et parent proche du prophète, est une figure importante dans l'alévisme (peinture par ). vignette|droite|240px|«Khamsa Al-i Aba», calligraphie alevi-bektachi représentant un visage humain dans lequel on peut lire Mahomet, Ali, Fatima Zahra, Hassan et Hussein. vignette|droite|240px|Représentation de Zulfikar, l'épée d'Ali. Les alévis bektachis attribuent la phrase suivante au prophète Mahomet, « Il n'y a pas de héros comme Ali, Il n'y a pas d'épée comme Zulfikar (lā fatā ʾillā ʿalī, lā saīf ʾillā ḏū-l-fiqār, لا فتى إلا علي لا سيف إلا ذو الفقار) ».
