Pseudonympha trimenii, or Trimen's brown, is a butterfly of the family Nymphalidae. It is found in South Africa.
The wingspan is 40âÂÂ52 mm for males and 44âÂÂ56 mm for females. Adults are on wing from early September to late November. There is one generation per year.
The larvae feed on Poaceae grasses, including Danthonia stricta and other coarse, wiry grasses.