We report two observations of the Dark-rumped Petrel (Pterodroma phaeopygia) off Oregon and California. Spear and Ainley made the first observation on 19 October 1986 at 0830 PST, while censusing birds from a southbound research vessel, at 44° 10' N, 130° 34' W, 500 km (270 nautical miles) off Cape Arago, Oregon. They watched the bird from the flying bridge as it flew west for about 45 seconds, as close as 150 meters, in good lighting. Pyle made the second observation on 2 August 1991 from a vessel conducting research as part of the California Cooperative Fisheries Investigations (CalCOFI) program, at 31° 55' N, 124° 11' W, 419 km (226 nautical miles) west-southwest of San Miguel Island, California, or 710 km (383 nautical miles) due west of Ensenada, Baja California. The bird was studied from the stern of the vessel, as close as 15 meters distance, at 0700 PST while the ship was collecting oceanographic data at CalCOFI station 83 110. The bird was attracted to a slick created behind the ship, over which it sallied for several minutes before departing.