The Revised Luyten Half-Second (LHS) Catalog contains refined coordinates and proper motion data for the high proper motion (HPM) stars listed in the Original Luyten Half-Second (LHS) catalog. The positional uncertainty in the Original LHS catalog is typically >10" and is often >30". The authors of the Revised LHS Catalog used the digital scans of the Palomar Observatory Sky Survey (POSS) I and POSS II plates to derive more accurate positions and proper motions for these objects. Out of the 4470 candidates in the LHS catalog, 4323 objects were manually re-identified in the POSS I and POSS II scans. A small fraction of the stars were not found due to the lack of finder charts and digitized POSS II scans. The uncertainties in the revised positions are typically ~2", but can be as high as ~8" in a few cases, which is a large improvement over the original data. Cross-correlation with the Tycho-2 and Hipparcos catalogs yielded 819 candidates (with red magnitude m_R <~12. For these brighter sources, the position and proper motion data were replaced with the more accurate Tycho/Hipparcos data. In total, there are revised proper motion measurements and coordinates for 4040 stars and revised coordinates for 4330 stars. This table was created by the HEASARC in October 2002 based on CDS Catalog I/279 (the 24-May-2002 version of the file catalog.dat). This is a service provided by NASA HEASARC .