The indoor air quality (IAQ) on-board the Swedish icebreaker Oden was examined during two field campaigns, in winter and in summer 2013. The measured parameters were temperature, relative humidity, air exchange rate and concentration of CO, CO2, NO, NO2, ozone, SO2, volatile organic compounds (VOC), formaldehyde, PAH, PM10, PM2.5 and submicron and ultrafine particles. Several indoor spaces of both living and working environments were investigated from the top to the bottom of the ship and outdoor air reference samples were collected at the same time. The results show in general that the IAQ on the ship is good with respect to the existing, recommended indoor air guideline values and occupational limit values. Concentrations in the living spaces were comparable with those in Swedish homes. The majority of the indoor air pollutants on the ship originated from the ship fuel evaporative emissions and operation of the main and auxiliary engines and boilers.