The application of data mining techniques in identifying important patterns from different data-set has becoming astonishing. This academic research work is aimed at discovering the applicability of data mining techniques on ART data-set in discovering implicit and non trivial patterns that will give a clue to policy makers and the other searchers in the area. Classification and association data mining functionalities of the data mining techniques were tested on ART data taken from two hospitals in Ethiopia. The research proved that both the classification and association rule mining had revealed important patterns that triggers further study on the topic.