Harknessiella is a genus of fungi in the class Dothideomycetes.
The relationship of this taxon to other taxa within the class is unknown (incertae sedis).
[1] This is a monotypic genus, containing the single species Harknessiella purpurea.
It was named after Harvey Willson “H.W.” Harkness.
[2] The genus was circumscribed by Pier Andrea Saccardo in Syll.