We analyze proton decays and neutron oscillations in the rishon model. Proton decay is forbidden in lowest order of the compositeness scale ΛH. In a one-generation rishon model, the leading proton decays violate B- L (e.g., p→ νπ+). The lifetime is given by τp∼ ΛH8/( UR2mp7), where UR∼ M(W R) is the mass scale of the right-handed W boson and mp is the proton mass. For UR∼500 GeV, the obtained limit for the compositeness scale is ΛH≳10 8 GeV. Neutron oscillations are also proportional to ΛH8 and cannot be detected in the foreseeable future. All of these predictions may depend strongly on the understanding of higher generations of quarks and leptons within the model.