Tidal stream projects in Scottish waters, which harness the energy in a flowing current at a tidal location, could create 11GW of power.
Meanwhile, tidal range schemes, which exploit the changing height of water in a tidal location, could create 12.5GW.
Rob Hastings, director of the Crown Estate Energy & Infrastructure Portfolio, said: "This report reflects our strategic interest in supporting development of wave and tidal projects around the UK.
"We hope it is a useful reference for both companies advancing development plans and government bodies implementing industry support measures.
"While the science of wave and tidal resource assessment is still emerging, and future work will clarify the resources that are practically available, it is clear that wave and tidal energy could contribute substantially to the UK's electricity needs."