Kosteletzkya is a genus of the plant family Malvaceae that includes the seashore mallow (K. pentacarpos). It includes about 19 species found worldwide.
Phylogenetic evidence supports this genus being polyphyletic, with New World and Malagasy species of Kosteletzkya belonging to completely different clades within the Hibisceae. Under a revised nomenclature, only New World species would retain the genus name Kosteletzkya. An alternate revision would be to merge all New World Kosteletzkya species into Hibiscus.
Species
19 species are accepted by Plants of the World Online as of October 2025: