We present evidences for the presence of a massive rotating disk/envelope around a luminous YSO associated with an UCHII region. The source, namely IRAS 07427-2400 with 50,000 solar luminosities represents a star of spectral type O8.5-O9. Its association with two massive bipolar outflows and a massive disk makes this the most massive YSO known till date forming via accretion mechanism. We estimate a mass accretion rate about 2.6E-2 solar masses per year and a life time of ~5600 yr resulting in a disk mass of 141+/-0.2 solar masses. Computation of the Jeans Mass for the observed disk temperature and number densities indicate that the disk can not undergo fragmentation by itself. High spatial and spectral resolution observations at near-infrared wavelengths can throw much light into the detailed properties of the disk/envelop structure and the velocities therein.