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The absolute visual and infrared magnitudes of moderately evolved OB-type stars are directly calibrated as a function of Stroemgren four-color and H photometric indices using the trigonometric parallaxes from the new reduction of Hipparcos data. The resulting calibrations have an average accuracy of 0.4 mag and, when applied to members of young open clusters, yield distances that are fairly consistent with those determined using the MV –(B −V ) zero-age main-sequence fitting procedure.