This diploma thesis examines the validity of choice of law agreements in the Rome III regulation. A choice of law in national divorce conflict law hardly existed before the commencement of the Rome III regulation. With choice of law, contracting parties gain security over the applicable law, especially when the objective connecting factor is convertible. By this early choice of law, the spouses are clear about how the divorce will be proceeded. In this diploma thesis the various choices of law in line with the Rome III regulation are examined. In addition, emerging issues occurring at the respective possibilities of choice of law such as the definition of habitual residence, multiple citizenship of individuals, as well as the situation of stateless persons and refugees are addressed. Moreover, this thesis presents possible solutions as to how multi-unit states must be dealt with when it comes to choice of law. Furthermore, matters of timing in regard to choice of law are discussed. Due to the fact that the choice of law agreement is a contract between spouses, substantive validity is discussed in this diploma thesis. This is followed by various opinions on the subject of union legal content control and a statement by the author. The Rome III regulation sets few requirements of form for the choice of law. Therefore, the member states can dictate additional formal requirements. Whether an implied choice of law can be carried out is not determined by the regulation. In the thesis, several controversies concerning implied choice of law are set forth and consequently the opinion of the author is stated. Finally, specific issues in the field of choice of law are discussed.