This handbook presents in one place much of the information needed to pursue a Ph.D. in Physics at Columbia. In the case of inconsistency with other sources of the same information, it is intended to supersede similar material on the Physics Department website. However, in the case of conflict with information provided by the website of the Graduate School of Arts and Sciences (GSAS), the information on that website should take precedence. Please send corrections or suggestions for improvements to the authors at [email protected] and [email protected].