UN Secretary General Ban Ki-moon's spokesperson Stephane Dujarric told reporters that Clooney has ended his service as a UN Messenger of Peace.
"After six years in this role, Clooney feels it is time to retire his official role as Messenger of Peace," Dujarric said adding that competing demands on their time from their professional and advocacy lives sometimes make it difficult for high-profile individuals to carry out a formal United Nations role.
Clooney's focus area as a messenger of peace was UN peacekeeping. The UN said Clooney is a "committed human rights advocate", who used his global appeal to focus public attention and support for United Nations peacekeeping efforts around the world.
In September 2006, Clooney spoke to members of the United Nations Security Council at an out-of-session meeting to help mobilize political action against the violence in Darfur.
Clooney has received three Golden Globe Awards and two Academy Awards. He recently proposed to 36-year-old international law attorney Alamuddin.