Galloway, nicknamed "Gorgeous George" for his permanent sun tan and smart suits, joined 10 other contestants on the show aired by Channel 4.
The "celebrities", including U.S. basketball star Dennis Rodman and Faria Alam who had an affair with England soccer coach Sven-Goran Eriksson, will be locked in a camera-filled house and gradually voted out by the public in the next 23 days.
Galloway said he wanted to show "a large and different audience what I'm really like". The flamboyant Scot, 51, was expelled from Labour in 2003 over his outspoken opposition to the war in Iraq and faced ridicule in the media for being a friend of ousted Iraqi leader Saddam Hussein.
However, standing for the anti-war Respect party, he overturned a Labour majority of more than 10,000 to win the east London seat of Bow and Bethnal Green in one of the bitterest campaigns of last May's election.
"Tony Blair will be in a dilemma. One part of him will want me to be evicted early so I don't score another victory," Galloway said before entering the Big Brother house.
"On the other hand, as long as I'm in there, I'm leaving him alone." Last October, U.S. congressional investigators said they had evidence that Galloway profited from the defunct UN programme created to protect Iraqis from the harsh effects of sanctions against their government.
They say he personally solicited and was granted oil allocations from the Iraqi government for 23 million barrels from 1999 to 2003. Incensed, Galloway flew to Washington and in a memorably feisty performance, harangued a Senate committee as he vehemently denied all the claims against him and attacked the U.S. decision to invade Iraq.Güncelleme Tarihi: 20 Eylül 2018, 18:16