Olavi Johannes Mattila (24 October 1918 – 4 August 2013) was a Finnish politician who served twice as the Finnish Minister for Foreign Affairs, and also held several other ministerial positions in a number of cabinets in the 1960s and 1970s.

Mattila worked in the diplomatic missions in Beijing, China and Buenos Aires, Argentina from 1952 to 1960.

For two short terms in 1960s and 1970s he hold the position of Minister of Trade and Industry as a non-partisan.

His son, Olli Mattila, who also worked as a diplomat in the foreign ministry, was convicted in the early 2000s for espionage.

[4] In 2002, he was visited by members of Jehovah's Witnesses studying the Bible with them, and he subsequently joined the religion.