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We calculate the relic density of the lightest neutralino in a supersymmetricseesaw type-II (``triplet seesaw'') model with minimal supergravity boundaryconditions at the GUT scale. The presence of a triplet below the GUT scale,required to explain measured neutrino data in this setup, leads to acharacteristic deformation of the sparticle spectrum with respect to the puremSugra expectations, affecting the calculated relic dark matter (DM) density.We discuss how the DM allowed regions in the (m_0,M_{1/2}) plane change as afunction of the (type-II) seesaw scale. We also compare the constraints imposedon the models parameter space form upper limits on lepton flavour violating(LFV) decays to those imposed by DM. Finally, we briefly comment onuncertainties in the calculation of the relic neutralino density due touncertainties in the measured top and bottom masses.

Dark matter in minimal supergravity with type-II seesaw