Creep-rupture characteristics of aluminum alloys 1100-0, 1100-H14, 5454-0, 5454-H34, and 6061-T651 were determined in the temperature range 93 to 731°C in tests of up to 64 000 h duration. The steady-state creep rates of 1100-0 and 5454-0 alloys are described precisely by a simple power relation that could not be applied to 1100-H14, 5454-H34, and 6061-T651 alloys because their microstructures changed at elevated temperatures. The Larson-Miller extrapolation technique yielded accurate predictions of the long-term rupture strength of 1100-0 and 5454-0 alloys but was not well suited for predicting the long-term rupture strength of aluminum alloys whose microstructures changed during testing. The rupture strength of notched specimens was always greater than that of similar smooth specimens at the same nominal stress.