Objective. Rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), and Sjögren's syndrome have been consistently associated with an increased risk of non-Hodgkin's lymphoma (NHL). This study was initiated to evaluate the risks of NHL associated with a personal or family history of a wide range of autoimmune diseases.Methods ). An increased risk of NHL was found for a personal history of 5 nonsystemic autoimmune conditions (autoimmune hemolytic anemia, Hashimoto thyroiditis, Crohn's disease, psoriasis, and sarcoidosis) (OR h ranged from 1.5 to 2.6) of 27 conditions examined.Conclusion. Overall, our results demonstrate a strong relationship of personal history of systemic autoimmune diseases with NHL risk and suggest that shared susceptibility may explain a very small fraction of this increase, at best. Positive associations were found for a personal history of some, though far from all, nonsystemic autoimmune conditions.