Ivo Willem Opstelten (born 31 January 1944) is a retired Dutch politician and jurist.

Opstelten served as acting Mayor of Beerta from 1 December 1983 until 1 March 1984 during a parental leave of Hanneke Jagersma.

Opstelten served as acting Mayor of Tilburg from 4 November 2009 until 16 July 2010 following the resignation of Ruud Vreeman.

The Cabinet Rutte I fell on 23 April 2012 after the Party for Freedom (PVV) withdrew their confidence and supply and continued to serve in a demissionary capacity.

On 6 November 2009 it was announced by Wim van de Donk, the Queen's Commissioner of North Brabant, that Opstelten had accepted the position as Acting Mayor of Tilburg after Mayor Ruud Vreeman's resignation was sought by the City council of Tilburg.

On 4 August 2010 Queen Beatrix nominated Opstelten as fifth informateur in the 2010 Dutch cabinet formation.

[1] On September 4, the Queen replaced Opstelten with Herman Tjeenk Willink, the Vice President of the Council of State as the new informateur.

Formateur Mark Rutte asked Opstelten as the Minister of Security and Justice in the new cabinet.

[4] During his tenure as Minister of Security and Justice, Opstelten was the driving force behind the closure of the majority of The Netherlands' coffeeshops and growshops effectively ending the successful 1970's instituted experiment where soft drugs were tolerated and separated from the hard drugs market.

[6] On 10 March 2015 Opstelten, along with State Secretary Fred Teeven resigned after it was discovered that Teeven, then chief public prosecutor authorized the return of 4.7 million guilders to convicted drugs dealer Cees H. in 2000, without the knowledge of his superior or the tax office.

[8] Preceding the affair which resulted in his resignation, Opstelten was already often accused of not knowing the facts during debates and having difficulty finding words in other cases.