Yes. Adult killer whales (orcas) are typically larger than adult great white sharks. NOAA Fisheries lists killer whales at up to 32 feet long and up to 11 tons, while white sharks reach about 21 feet and up to roughly 4,500 pounds.
That size gap matters in the water: orcas are the ocean’s top predator and the largest members of the dolphin family, and documented encounters show they can hunt and displace great whites. Great whites remain among the largest predatory sharks, but they are smaller and lighter than a full-grown killer whale.
Source: Killer Whale — NOAA Fisheries (size facts also compared with White Shark — NOAA Fisheries).