Critical Thinking is an Open Educational Resource (OER) textbook focused on Critical Thinking with a particular emphasis on Psychology and the Social Sciences. It addresses the need for students to critically evaluate information in an era where access to information is vast, but misinformation is prevalent. This resource also attempts to introduce students to the universality of critical thinking instead of the narrower views prevalent in most textbooks. The textbook combines new material authored by the project lead, Dinesh Ramoo, with adaptations from other OER resources.