Proper Names and Propositional Attitudes Seyed Mohammad Yarandi Abstract: The thesis concerns the semantics of proper names in the context of propositional attitude reports. The semantic contribution of names in the scope of attitude verbs famously generates a puzzle, known as Frege~s puzzle. In the thesis, different semantic theories of propositional attitude have been categorized based on their strategy to solve the puzzle. The thesis consists of two parts. The first part (chapters 1-4) critically surveys different solutions of the puzzle in the literature. The discussion of different theories and their shortcomings sets the stage for the second part. The second part (chapters 5-6) provides a new solution to the puzzle. The solution is based on a new theory concerning the mechanism of reference and meaning of proper names. The meaningful use of proper names is argued to require the satisfaction of a competence condition which is used to explain peculiarities of reference found in both their regular contexts, as well as in the context of propositional attitude verbs.