Oxygen fugacities have been estimated for the high-grade portion of the Bamble granulite facies terrane, SE Norway, using both titaniferous magnetite-ilmenite and orthopyroxene-titaniferous magnetite-quartz oxygen barometers. The two oxygen barometers show good agreement, for samples indicating high titaniferous magnetite-ilmenite temperatures whereas agreement is poor for low-temperature samples. Oxygen fugacities estimated from titaniferous magnetite-ilmenite are considerably lower than those estimated from orthopyroxene-titaniferous magnetite-quartz. This discrepancy increases with a decrease in temperature, which appears to reflect preferential resetting of the hematite content in the ilmenite grains, without much alteration of the more numerous titaniferous magnetite or orthopyroxene grains. The mean temperature for the non-reset samples, 795 ± 60°C (1σ), agrees well with temperatures obtained from garnet-orthopyroxene exchange thermometry in the same region, 785 ± 60°C (1σ). Most non-reset oxygen fugacities range from to - 14, well above quartz-fayalite-magnetite at 7.5 kb. These results were derived using an internally consistent data base for both the endmember phases and for the oxide and pyroxene mixing models. Similar conclusions are reached if Andersen's titaniferous magnetite-ilmenite thermometer/oxygen barometer is used. The non-reset oxygen fugacities also agree well with an independent study of the Bamble granulites by Cameron. The QUIlP equilibrium (Quartz-Ulvospinel-Ilmenite-Pyroxene) is used to project self-consistent equilibrium temperatures and oxygen fugacities for samples reset due to hematite loss from the ilmenite grains. These projected temperatures and oxygen fugacities agree reasonably well with non-reset samples. The mean projected temperature is 830 ± 40°C (1σ). This agreement strongly supports the conclusion that low titaniferous magnetite-ilmenite temperatures (down to 485°C) and accompanying low-oxygen fugacities are the result of hematite loss from the ilmenite grains at some time after granulite-facies metamorphism.