Chronic inflammatory demyelinating polyneuropathy (CIDP) may develop as an isolated, idiopathic disorder or may occur with a temporal relationship to other systemic disorders. We report two cases of chronic inflammatory demyelinating polyneuropathy and membranous glomerulonephropathy (MGN) occurring in the same patients. In each case, the two disorders manifested in close proximity to each other. These two cases supplement previously reported cases of MGN as a coincident and potentially causally related comorbidity to CIDP. We review previous reports of MGN associated with the full spectrum of inflammatory demyelinating polyneuropathies (IDP).