This research is an application of Hill Cipher cryptographic techniques in the process of encoding messages in the form of Arabic text. Hill Cipher is a classic cryptographic algorithm that uses modulo matrix and arithmetic in its application. The Arabic text used in the Hill Cipher cryptographic technique includes hijaiyyah letters ا, ب, , ي, أ, إ, ؤ, ئ, ى, ة, space , ., ،, ؟, !, and Arabic numbers 0, 1, 9, so the modulo used is                    . This study discusses the steps in encrypting messages with examples of their application in securing Arabic text documents.