Pentti Juhani Oinonen (born 11 June 1952 in Kontiolahti) is a Finnish politician and member of Finnish Parliament, representing the Finns Party.
He was elected to Finnish Parliament in 2007 for Northern Savonia, and maintained his seat in 2011.
In 2015 Oinonen was re-elected again, this time for Savonia-Karelia.
On 13 June 2017, Oinonen and 19 others left the Finns Party parliamentary group to found the New Alternative parliamentary group, which later became known as Blue Reform.