Abstract: Primary diffuse large lymphoma of urinary bladder is a rare extra nodal lymphoma with very few reported cases in literature. Amongst the reported cases of primary urinary bladder lymphoma, low grade lymphoma of MALT is the commonest, while amongst the high grade, diffuse large B cell lymphoma is the commonest. We report a case of elderly lady presenting with pain abdomen and dysuria, which upon investigation diagnosed as primary diffuse large B cell lymphoma of urinary bladder.