Jiří (Juraj) Paclt (15 January 1925 – 18 September 2015) was a Czechoslovakian botanist and entomologist. Although born and raised in the Czech part of Czechoslovakia, he spent the majority of his work life in the Slovak part that later became Slovakia. His scientific work is characterised by a wide scope of interests and activities, ranging from botany over mineralogy to entomology. The standard author abbreviation Paclt is used to indicate this person as the author when citing a botanical name.