This study examined the reproductive ecology of eight Eastern Pacific deep-sea octocorals, collected from Washington to Southern California. The sexuality, reproductive mode, oocyte size, and fecundity of each species were identified using histological techniques. This research increases the knowledge of basic life histories of deep-sea corals. Swiftia simplex had the highest total fecundity of 42.53 (±9.82 SE) oocytes per polyp. Mean oocyte diameters in S. simplex and S. pacifica females differs among sample months. Swiftia pacifica and S. kofoidi had the lowest total fecundity: 4.6 (±2.06 SE) and 3 (±1.53 SE) oocytes per polyp, respectively.