In this article, the author examined the relationships of motivation and flow experience to academic procrastination in 262 Korean undergraduate students who completed a questionnaire on procrastination, flow, and motivation. The results indicated that high procrastination was associated with lack of self-determined motivation and low incidence of flow state. The results also indicated that, although amotivation and intrinsic motivation showed significant unique effects on procrastination, they did not contribute significantly to the variance in procrastination when the effects caused by flow experiences were considered. The author discusses implications for practice and gives suggestions for further research. (Contains 2 tables.)