The objective of this study was to investigate the effect of storage upon the quality of okra (Abelmoschus esculentus (L.) Moench) seed graded by size. Ten samples of 1.500g each from a lot of okra seed ?Seleção Piranema? harvested at the Experimental Station of Itaguaí (PESAGRORio) in 1978, were graded by size with an air screen machine. The round perforations in each screen were 16/ 64, 12/64, 10/64 and 8/64 inches in diameter and allowed to grade different classes. Once two major classes, >12<14 (large seeds) and >10<12 (small seeds) contributed with 52.7% and 44.0% respectively, for the composition of the original lot, the work was conducted only with these two classes and the original lot. They were packaged in cloth bags and stored by a period of 12 months in a dry chamber (26oC and 49% RH) and in open storage (27oC and 67% RH). The quality of the seeds was evaluated from the first day and monthly during the storage period, through the germination, hard seeds content and vigor, related with the moisture content of the seeds. The results showed no difference between classes and the original lot when stored in dry chamber. In open storage the large seeds had statistically superior germination than the others. Further this was the best storage condition for any seed size, since the percentage of hard seeds increased significantly in the dry chamber just after storage. The seeds from the original lot and the largest ones showed higher vigor index than the smaller, regardless of the storage conditions.