Karl von Zois zu Laibach (18 November 1756 – 29 October 1799) was a Carniolan amateur botanist and plant collector.

[1] He is best known today as the namesake of zoysiagrass,[2] which was named by Carl Ludwig Willdenow in 1801.

[3] Karl von Zois was born in Ljubljana and baptized Carolus Philippus Eugenius Zoiss.

[4] The Zois family was of Lombard origin; Karl's father was Michelangelo Zois (1694–1777), a merchant who married a Carniolan noblewoman, and was nobilitated in 1739.

His brother was the natural scientist and patron of the arts Sigmund Zois.