Rheumatoid arthritis is a chronic systemic autoimmune disease which is typically present in adulthood, more common in women than men and affecting e0.5- 1% of the adulth population.Many auto-antibodies could be implicated in the pathogenesis of the disease of these Anti-RA33 antibodies and anti-CCP antibodies in addition to rheumatic factor (RF). This case control study was doing during the period from January 2021 to August 2021.Its conducted on (105) patients with RA match with (45) healthy control. RF, anti- CCP and RA33 were positive in 84( 80% ), 89(84.7 %),and 100 ( 96.1 %) patients with RA, respectively. the anti-CCP antibody showed 100% sensitivity for the detection of RA, and the anti-RA33 antibody showed a sensitivity of 96.1%. Anti-CCP demonstrated more favorable predictive values for RA than anti-RA33 and RF. there is a highly significant difference (P≤0.05) when compared between RA patient groups and control group. In this study the mean levels of all auto-antibodies ( RF, anti-CCP, RA33 )were increased significantly(P<0.05) in RA patients(113±81 , 92.3 ±87.5, 336±110),respectively compared with control group .The age group (61-≥70)group appeared significant higher mean level of RF, anti-CCP, RA33 than other age groups.