The term "mosque" comes from the Arabic language ("masjid", "place of prostration"). The Arabic term "jami" (Turkish "cami") is generally used for the large mosque, also known as the "Friday mosque".

The mosque is the most important religious center of Muslim community life. It is not only a ritual space, but also a general social meeting place for Muslims of different origins and languages. In addition to teaching the religion and religious values, mosques are also a place of integration. Koran lessons, learning Arabic, German courses and homework help are all part of the educational program. Social activities such as Islamic festivals, weddings and other festivities as well as sports programs are also organized. In Germany, most mosque communities are organized as registered associations. They are financed by members' contributions and donations.

There are around 15 mosques or Islamic religious associations in Wiesbaden (as of 2015), including the Afghan Cultural Association founded in 2007, the Ahmadiyya Muslim Jamaat Association, the Educational and Cultural Association, which is part of the Association of Islamic Cultural Centers (VIKZ), the association Islamic Community - Mosque Omar Ibn Al Khattab, the association Diyanet - Turkish Islamic Community Wiesbaden Merkez Camii founded in 1979, the association IGMG - Islamic Community Mili Görüs (founded in 1994), the association Islamic Community - Tauhid Mosque founded in 1998 in Fischbacherstrasse, the Islamic Community of Bosniaks Wiesbaden, founded in 1993 and based in Rheinstrasse, the Islamic Cultural Association Masjid Ali in Alt-Kostheim, founded in 1997, the Islamic Cultural Association Imam Hossein (founded in 1997), the Moroccan Association for the Promotion of Spiritual and Cultural Property Masjid Badr in Schierstein, founded in 1996, the Tariqa Al-Qadiriya Al Boutschischiya Sufi Order for Love, Tolerance and Humanity (founded in 2009), the Vahdet Camii association founded in 2005 in Bertramstrasse, the West-Eastern Diwan Wiesbaden and Surroundings or Association for International Understanding between East and West (Sunni) (founded in 1988). The imam of the At-Taqwa Mosque at Helenenstraße 9, Ahmad Abrar, comes from India and has been in office since 2009.