The mortality patterns of workers between 1943 and 1977 in three oil refineries (SIC-2911) in Texas were investigated. Union membership records and state vital records were examined to obtain information on date and cause of death, age, sex, race and work histories. Proportional mortality rations (PMR) for various cancer sites were determined using United States population rates as the standard. Excess mortality from stomach cancer was noted for active union members at refinery A and for active and retired members at refineries B and C. PMRs for leukemia, multiple myeloma, and other lymphoma were elevated especially among retired workers. Brain tumor deaths were elevated in all three refiners and were slightly elevated in retired workers from refineries A and C. The authors conclude that oil refinery workers have elevated risks of brain, stomach, hematopoietic, and lymphatic malignancies.