The development of library cooperation in the Philippines, particularly among academic, school, and special libraries, started in the early 1930s and was known under different names (Ladlad, 2003), such as resource sharing, partnership, consortium, linkage, library cooperation, and networking. Libraries usually come together in the form of consortia to supplement existing resources by providing access to information available in other libraries. Through cooperation, libraries are able to withstand the skyrocketing prices of information resources as well as budget cuts by means of consortium/cooperative purchasing. Likewise, library cooperation has proven to be an effective way of presenting smart solutions to common library problems/concerns through communities of practice. This chapter provides an overview of major library consortia in the Philippines. The compiled list is as exhaustive as possible. However, due to scarcity of sources, some active consortia may not have been included in the list. The information provided in this chapter was gathered mostly from published Websites. A comparative study, in terms of aims/objectives and activities being carried out by the different consortia, was also included and can be found at the end of this chapter.