Yvonne Elisabeth Marie Antoinette Timmerman-Buck (born 26 July 1956) is a Dutch politician of the Christian Democratic Appeal (CDA) party and jurist.

Her father Werner Buck was a politician of the Catholic People's Party and was State Secretary of Housing, Spatial Planning and the Environment in the Cabinet Biesheuvel I. Timmerman-Buck was vice president of the Dutch Equal Treatment Commission from 1994 until 2001.

She was President of the Senate in the period 2003–2009, the first female to have the position.

[1][2] Timmerman-Buck has been a member of the State Council since 1 November 2009.

This article about a Dutch Christian Democratic Appeal politician is a stub.