The Department of Mathematics of Hokkaido University organizes the International Workshop on Potential Theory 2009 in Hokkaido University, Sapporo, September 1 - 4, 2009. The workshop is related to the XXIst Rolf Nevanlinna Colloquium in Kyoto September 7 -11, 2009. The IWPT is intented to be a rather informal and relaxed workshop of small number of people, concentrating on potential theory and analysis. People interested in Potential Theory and related fields are welcome to take part in the workshop.