The Virtual Heliospheric Observatory (VHO) provides a single point of uniform discovery, access, and use of data about the heliosphere. The VHO accomplishes this goal by uniting a number of distributed repositories for heliospheric data. VHO is a project within NASA's Heliophysics Data Environment and is maintained within the Heliospheric Physics Laboratory at NASA's Goddard Space Flight Center. The VHO utilizes the SPASE data model and provides uniform metadata for heliopheric data sets. A prominent feature of the VHO is the query interface, which provides uniform access to the distributed data sets within VHO. The VHO actively collaborates with the Virtual Energetic Particle Observatory and the Virtual Waves Observatory to enable access to energetic particle and waves data, respectively.