Sidnei is a masculine given name of Portuguese origin. People with that name include:
Sidnei (Cape Verdean footballer) (born 1986) Sidnei da Silva (born 1980), Brazilian footballer Sidnei (footballer, born 1983), full name Sidnei Siqueira Lourenço, Brazilian football left-back Sidnei Sciola (born 1986), Brazilian footballer Sidnei (footballer, born 1989), Sidnei Rechel da Silva Júnior, Brazilian football centre-back
See also Sidney (disambiguation) Sydney (disambiguation)