In chemistry, post-transition metals are the metallic elements in the periodic table located between the transition metals (to their left) and the metalloids (to their right). Usually included in this category are gallium, indium and thallium; tin and lead; and bismuth. Which elements are counted as post-transition metals depends, in periodic table terms, on where the transition metals are taken to end and where the metalloids or non-metals are taken to start.

On appelle métal pauvre un élément métallique du bloc p dans le tableau périodique. Il s'agit des éléments suivants :

• Aluminium ₁₃Al
• Gallium ₃₁Ga
• Indium ₄₉In
• Étain ₅₀Sn
• Thallium ₈₁Tl
• Plomb ₈₂Pb
• Bismuth ₈₃Bi
• Polonium ₈₄Po