Brassica hilarionis is a species of perennial cruciferous plant in the family Brassicaceae.

[citation needed] Brassica hilarionis is a perennial subshrub that grows in the subtropical biome of Northern Cyprus.

It is hairless and has a basal rosette of rounded, fleshy leaves with flat stalks.

From March to May, B. hilarionis produces large racemes of creamy white flowers with petals up to 2.5 centimeters (0.984 inches) long.

It inhabits rocky areas and has been recorded growing on limestone cliffs at altitudes of 400-850 meters.