This course is a seminar-based discussion of the use of logic in understanding philosophical topics. Resources on a range of topics is provided at the beginning of the semester. At the first meeting, we select an agenda of common interest. Topics from previous years include philosophy of mathematics, history of logic, paraconsistent logic and mathematics, Fitch's paradox, logical omniscience, belief revision, the surprise examination paradox, knowledge and justification, rational agency, scientific inquiry, probability theory, time travel, and opinion dynamics. Students are expected to prepare for the discussion of each topic and will give a number of presentations throughout the semester.