Abstract. In this work we consider the Hide-Skeldon-Acheson dynamo modelwhere α, β, κ and λ are parameters. We contribute to the understanding of its global dynamics, or more precisely, to the topological structure of its orbits by studying the integrability problem. Provided α = 0 we identify the values of the parameters of this model, for which it admits a first integral. Also, as corollary of our main results we get that for α, β, κ = 0 the dynamo model does not admit a polynomial, rational or Darboux first integral.