PISMIS 6 and the F0 IA supergiant HD 74180

New photoelectric UBV observations of stars in the open cluster Pismis 6 and existing photometry and spectroscopy of several nearby OB stars are used to determine the intrinsic properties of the luminous supergiant HD 74180 (F0 Ia). Thirty cluster members are identified in Pismis 6 and yield a distance modulus of (V₀ - Mv) = 11.34 plus or minus 0.09 (s.e.) and mean reddening E(B - V) = 0.46 plus or minus 0.04 (s.d.). The cluster age is estimated to be 8 plus or minus 2 Myr. Pismis 6 appears to be part of a physical group that includes the F supergiant and the nearby OB stars. The position of HD 74180 in the theoretical HR diagram suggests it may be a lower-mass analogue of the hypergiant IRC+10420, which Jones et al. (ApJ, 411, 323 (1993)) have suggested is evolving blueward in the HR diagram from the red supergiant region, possibly on its way to becoming a Wolf-Rayet star.