Brenthis ino, the lesser marbled fritillary, is a butterfly of the family Nymphalidae.

[1][2] This species prefers damp meadows and bogs at an elevation of 0–1,500 metres (0–4,921 ft) above sea level.

The basic color of the upper side of the wings is orange with several dark brown blotches.

The lower side of the wings is creamy orange with an indented edge and dark brown blotches on the forewings, while the hindwings show brown-edged beige blotches and some ringed dark brown and violet shading spots.

The larvae feed on meadowsweet (Filipendula ulmaria), dropwort (Filipendula vulgaris), stone bramble (Rubus saxatilis), raspberry (Rubus idaeus), Aruncus species, Spiraea species and salad burnet (Sanguisorba minor).