Gravitational wave contribution to CMBR anisotropy V.N. Lukash 1 and E.V. Mikheeva 2 Astro Space Center of P.N.Lebedev Physical Institute 3 , Profsoyuznaya 84/32, Moscow 117810, Russia We argue that the contribution of cosmic gravitational waves into the large­scale CMBR anisotropy can exceed 50% for a broad class of the inflationary models with effective \Lambda­term producing the standard local spectrum of primordial cosmological perturbations. ... 10 7 k hor (Figure 2). ...