This document provides information about a special issue of the Journal of King Saud University - Computer and Information Sciences on Arabic natural language processing. It lists important dates for the submission and review of extended abstracts, full papers, and the final version. The special issue seeks unpublished high quality papers on current research related to Arabic NLP, including topics such as part-of-speech tagging, morphological analysis, word sense disambiguation, named entity recognition, machine translation, and text summarization. The guest editors of the special issue are listed.