Porz is a borough or Stadtbezirk of Cologne, Germany. It is situated on the east side of the Rhine in the south-east of the city. Porz is the largest borough of Cologne by area at 78.92 km2 and has 113,500 inhabitants. Porz borders with the Cologne boroughs of Kalk and Innenstadt to the North, Rheinisch-Bergischer Kreis and Rhein-Sieg-Kreis to the East and South, and the Rhine to the West. On the other riverbank lies the Cologne borough of Rodenkirchen.