The Eric Alexander Memorial Library was established in October 1995, by Joan and Stanford Alexander, of Houston, Texas, in honor of their son, a 1983 graduate of Landmark High School. The Library, located in the Alexander Academic Center, provides the school community with access to information in both traditional and emerging formats. With an ever-expanding print collection of over 8000 reference and circulation materials and a DVD/Video collection of 300, the Library continues to represent and parallel the curriculum. In addition to assignments and research, the students are encouraged to use the library for recreational reading and learning. A bank of wireless computers accommodates the application of online research and information through the Internet and electronic databases.

The Charles Harris Reading Room is the professional library for teachers and educational specialists. The collection consists of books, monographs, and academic journals, which correspond to historically significant and contemporary issues pertinent to education, learning differences, and current adolescent issues. The acquisition of print materials is driven by the postgraduate research and scholarship of teachers and visiting educators.