Felicjan Odrowąż Sypniewski, also known as Felicyan Sypniewski was a Polish naturalist, botanist, entomologist, malacologist, algologist and philosopher.

Sypniewski is a Polish surname centered on the Oder region where families bearing this surname are still found today. Sypniewskis can also be found all over the world, particularly in the United States, Brazil, and Germany.