We present a characterization of inclusion among Riesz−Medvedev bounded variation spaces, i.e., we shall present necessary and sufficient conditions for the Young functions \(\varphi_1\) and \(\varphi_2\) so that \(RV_{\varphi_{1}}[a,b]\subset RV_{\varphi{_{2}}}[a,b]\) or \(RV^*_{\varphi_{1}}[a,b]\subset RV^*_{\varphi_{2}}[a,b]\).
