The Type III See-saw Models are extensions of the Standard Model with some fermion triplets, with the purpose of generating neutrino masses. The minimal cases, which can explain the smallness of neutrino masses even having relatively light triplets and large coupling constants, consist in the addiction of 2 or 3 fermion triplets. In this seminar, we will review the main aspects of these models and we will show the (preliminary) updated bounds on their validity.