Gabriel Rzączyński (6 July 1664 – 12 November 1737) was a Polish Jesuit, naturalist, geographer, and writer.
Rzączyński was born in Podlasie, from a family bearing the Ślepowron coat of arms, and joined the Jesuit order in 1682 and became a grammar teacher from 1687 at Lublin.
In 1692 he taught theology at Kraków, still later rhetoric and philosophy at Toruń, Lublin and Poznań, and Łuck.
Following his wide travels he wrote on the curiosities of natural history in his Historia naturalis curiosa Regni Poloniae, Magni Ducatus Litvaniae, annexarumque provinciarum, in tractatus XX divisa (1721).
[1] In 1745 was published posthumously his Auctuarium [sic] historiae naturalis curiosae Regni Poloniae, Magni Ducatus Lithvaniae, annexarumque provinciarum, concinnatum.