Muamalat (also muʿāmalāt, Arabic: معاملات, literally "transactions" or "dealings") is a part of Islamic jurisprudence, or fiqh. Muamalat has been defined as Islamic "rulings governing commercial transactions", but also more broadly to include civil acts and in general all aspects of fiqh that are not Ibadat, i.e. not acts of ritual worship such as prayer or fasting, (See organizational chart of the structure of Islam below in "Principles" section.)

Mu'amalat provides much of the basis for Islamic economics, and the instruments of Islamic financing, and deals not only with Islamic legality but also social and economic repercussions and the rationale of its prohibitions (according to Monzer Kahf). Even a broad definition of Muamalat does not deal with all aspects of property and money in Islam, as zakat — compulsory alms giving that is one of the five pillars of Islam — is part of Ibadat division of fiqh.

According to at least one author (Monzer Kahf), Mu'amalat "sets terms and conditions of conduct for economic and financial relationships in the Islamic economy" and provides the "grounds on which new instruments" of Islamic financing are developed. It also extends beyond discussions of Islamic legality "to the social and economic repercussions of alternative legal forms of economic or financial relationship and analyze the rationale behinds [sic] it."

According to Hosein Askar, Zamir Iqbal, and Abbas Mirakhor, a "significant subset" of muamalat "defines the conduct of economic activities" within the economic system, which "ultimately lays down the rules for commercial, financial and banking system."

According to Aznan Hasan, basic principles of muamalat, are that dealings and contracts in Islam ...

According to Abdullaah Jalil, Asharaf Mohd Ramli, Syahidawati Shahwan there are four "theories" that underlie the framework of Mu'amalat dealings:

Authors Jalil, Ramli and Shahwan also list differences between Mu'amalat and 'Ibadat."

According to muamalat, contracts ...