Some ferrocene compounds, such as tamoxifen derivatives hydroxyferrocifen 1 and ferrociphenol 2, show strong antiproliferative activity on hormone-dependent and hormone-independent breast cancer cells. In order to evaluate their antimicrobial activity, they were tested, together with their purely organic analogs, on the bacteria Pseudomonas aeruginosa and Staphylococcus aureus and the fungus Candida