thumb|Rendzina soil ([[Castelltallat)]]
thumb|Rendzina soil on the Maastrichtian Chalk in [[Kozubów Landscape Park, Poland]]
Rendzina (or rendsina) is a soil type recognized in various soil classification systems, including those of Britain and Germany as well as some obsolete systems. They are humus-rich shallow soils that are usually formed from carbonate- or occasionally sulfate-rich parent material.
In the World Reference Base for Soil Resources, rendzina soils would be classified as leptosols, chernozems, kastanozems, or phaeozems, depending on their specific characteristics. At the same time, biological activity leads to an accumulation of humus in the surface soil, which is protected from further decomposition by the clay. The upper soil horizon of a rendzina therefore contains considerable amounts of humus.