HD 150136 is a triple system of massive O-type stars in the southern constellation of Ara. It consists of a double-lined spectroscopic binary with a more distant tertiary companion. The last star is orbiting the other two with a period of 8.2years, an eccentricity of 0.73, and an inclination of 108°. The estimated masses of the stars are 7001630000000000000♠63±10, 7001400000000000000♠40±6, and 7001330000000000000♠33±12 times the mass of the Sun. This system contains the brightest stars in the NGC 6193 cluster.