We report a Shigella sonnei outbreak of 46 cases that occurred in Norway during October 2011. Two municipalities were involved. A large cluster (42 cases)was concentrated in north Norway, while a smallcluster (4 cases) occurred in the south-east region.Epidemiological evidence and trace back investigations have linked the outbreak to the consumption of imported fresh basil. The product has been withdrawn from the market. No further cases have been reported since 25 October.