Romellina is a monotypic, genus of fungi within the class Sordariomycetes. It has only one known species, Romellina variabilis. The genus was circumscribed by Franz Petrak in Sydowia vol.9 (1-6) on page 597 in 1955. The genus name of Romellina is in honour of Lars Romell (1854–1927), who was a Swedish botanist and mycologist, he was a teacher in Stockholm, then between 1890 - 1927, he was a patent attorney. The relationship of this taxon to other taxa within the class is unknown (incertae sedis).