Oedemera tristis is a species of beetle belonging to the family Oedemeridae subfamily Oedemerinae.

Oedemera tristis can reach a body length of about 9–12 mm (0.35–0.47 in).

[1] Males have large, swollen posterior thighs (metafemurs).

[citation needed] The elytra are divergent at their ends and reveal the wings.

[citation needed] It feeds on nectar and pollen from the flowers of herbaceous plants (dandelions, buttercups, etc.).