In this General Technical Report, we review 12 large-scale silviculture experiments (LSSEs) in western Washington and Oregon with which the Pacific Northwest Research Station (PNW) of the USDA Forest Service (USFS) is substantially involved (fig. 1, table 1). (For the purposes of this report, western Oregon and Washington is defined as the part of those states located west of the crest of the Cascade Range.) We expand upon previous overview efforts that have provided general summaries of many of these LSSEs (e.g., Monserud 2002, Peterson and Monserud 2002, Reutebuch et al. 2004). Our goal is to provide forest managers, planners, and scientists with detailed information about each LSSE and to organize this information in such a way as to facilitate comparison among studies.