Pedro I may refer to:
*Pedro I Fadrique (died in 1355)
*Pedro I of Portugal (1320–1367)
*Pedro of Castile (known as ''The Cruel'') (1334–1369)
*Pedro I of Kongo (ruled 1543–1545)
*Pedro I of Brazil (1798–1834)
See also
*Peter I (disambiguation)
{{hndis, Pedro 01
pl:Piotr I