In Thomas Aquinas, a seven-hour course, Bishop Robert Barron guides us through a study of the theological and philosophical system of Thomas Aquinas, the 13th-century Dominican friar who masterfully synthesized Ancient Greek philosophy with Christian doctrine. We examine his Five Ways for demonstrating God's existence, his understanding of divine attributes and the Trinity, and his teachings on creation, providence, and the problem of evil. The course delves into Aquinas's philosophical anthropology, particularly the relationship between body and soul and humanity's creation in God's image. We conclude by studying his ethical framework centered on finding happiness in God as humanity's ultimate goal, and the role of virtues in ordering human life toward God.