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We consider the calibration of luminosities and intrinsic colors of A and F supergiants in terms of near infrared features. We calibrate ${\rm M_V}$ in terms of the equivalent width of the ${\rm O\thinspace{\tenrm I} \thinspace\lambda 7774}$ feature from a sample of 14 stars in 13 Galactic clusters. The rms dispersion about this relation is $\sim$0.5 mag.
Using this same sample, plus one association member, we calibrate ${\rm(B-V)_\circ}$ in terms of the strength of the infrared Calcium triplet. The rms dispersion about this relation is 0.056 mag.
We investigate these relations with a large sample of A and F supergiants in the Magellanic Clouds. The possibility of using these luminous stars as standard candles is discussed.
