The book aims to highlight the magnificent and valuable work of old jurists and modern scholars in contracts and transactions. The book has been written to serve as a textbook for the subject of 'Islamic Law of Contract' studied by the students of L.L.B at International Islamic University as a part of their prescribed scheme of study. It may also prove to be helpful for students of Economics and Business Administration and for all those who are interested in studying the Business Law of Islam. The book is divided into two parts. The first part deals with the general theory of contracts in Islam wherein topics such as general principles of contracts, elements of a contract, delegated authority, division of contracts into valid, voidable and void contracts, gharar , Riba , extrinsic conditions, defect of consent, and the classification of contracts concerning their subject matter have been discussed. The second part deals with specific contracts such as contracts of sale, leasing, partnership, mudãrabah, suretyship, and assignment of debt. While dealing with these contacts, both theory and practice have been emphasised. For example, under mudarabah contracts, not only have the conditions of mudarabah in fiqh been identified, but their banking applications have also been discussed.