Baruch Jacob Placzek (1 October 1834 – 17 September 1922), also known by the pen name Benno Planek, was a Moravian rabbi, author, poet, orator, and naturalist. He was the last Landesrabbiner of Moravia, which position he held from 1884 until his death. As a writer, he published numerous sermons, speeches, and obituaries, as well as scientific, lyrical, and narrative works.