Actinomycosis is an uncommon chronic infection. It usually occurs in the cervicofacial, thoracic and abdominopelvic region. In abdominopelvic actinomycosis the ileum, ceacum and appendix is involved usually as a mass. In our case, there was no mass clinically or radiologically. He had tenderness right lower quadrant of abdomen, clinical diagnosis of acute appendicitis was made and appendicectomy done. Histopathological report showed bacterial colony or sulphur granules surrounded by acute and chronic inflammatory cells.