The synthesis and characterization of four di- and tri-n-butyltin cysteaminates and N,N-dimethylcysteaminates and three protonated / quaternized derivatives are reported. They all exhibit moderate or high in vitro cytotoxic activity. Six of seven compounds presented in this work are more active than cisplatin, etoposide and 5-fluorouracil, but less active than methotrexate and doxorubicin.