Eutomostethus luteiventris is a species of sawflies belonging to the family Tenthredinidae, subfamily Blennocampinae.

[1] This species is present in the Nearctic realm and in most of Europe, with exception of the Balkan and Iberian Peninsula.

[3] Eutomostethus luteiventris can reach a length of 5–7 millimetres (0.20–0.28 in).

Abdomen is orange, with black basal plates and apical segments.

Legs are mainly orange, but the apical half of the forefemurs are black.