This is an introduction course in theoretical corporate finance for Ph.D. students. This course has the objective of introducing doctoral students to theoretical research in corporate finance. The emphasis will be on incomplete information models, though a few models driven by other considerations will also be studied. The first part of the course will examine the fundamentals of corporate finance theory (e.g., the theory of the firm's choice of its capital structure and dividend policy under alternative assumptions), as well as various tool areas in corporate finance (e.g., the notion of moral hazard and agency problems, adverse selection and signaling, various aspects of non-cooperative games with and without incomplete information, and the equilibrium concepts in such games). The second part of the course will focus on a couple of important related topics which are the focus of recent research in corporate finance.