Kadapuram Abraham Isaac (Malayalam: കാടാപുരം എബ്രഹാം ഐസക്ക്) (10 July 1925 – 12 September 2005) was an Indian writer and librarian. He was a Professor and Head of the Department of Library and Information Science at the University of Kerala, Thiruvananthapuram. Isaac was known for initiating and moulding the professional Library and Information Science (LIS) education in Kerala and has authored several books on Library and Information Science. He had served as a member of the Senate of the Kerala University and as Dean of its Arts Faculty.