An instance of multiple myeloma (MM) in a married couple is discussed, since cases of MM in husband and wife have rarely been observed. The patients were aged 60 when the disease was discovered, and the interval between the diagnosis in the mates was 44 months. Genetic or environmental factors that could have explained the occurrence of myelomatosis were not found in these spouses. Therefore, on absence of a defined cause, our observation, like others previously reported in the literature, should be considered, although exceptional, a chance event.