Louse Wies Sija Anne Lilly Berthe "Lousewies" van der Laan (born 18 February 1966) is a retired Dutch politician of the Democrats 66 (D66) party and jurist.

She obtained the International Baccalaureate at Armand Hammer United World College of the American West (In Montezuma, New Mexico).

After graduating in 1984, Van der Laan moved to the Netherlands to study law at the University of Leiden.

Between 1995 and 1997 she worked for the Cabinet of Dutch European Commissioner for External Relations, Hans van den Broek.

In the European Parliament she was active on a range of issue focusing on civil liberties, environmental affairs, budget and international relations.

She was the spokeswoman of her party on foreign policy, higher education, justice, technology, European affairs and gay rights.

[1] Lousewies van der Laan lost out to Alexander Pechtold in the June 2006 D66 leadership election.

From January 2009 until 2015 she was employed as the Chef de Cabinet working for the Presidency of the International Criminal Court in The Hague.