Theodore Calvin (Ted) Arnott (born April 8, 1963 in Fergus, Ontario) is a Progressive Conservative member of the Legislative Assembly of Ontario representing the district of Waterloo—Wellington.

Arnott received a Bachelor of Arts degree from Wilfrid Laurier University in 1985 and a Diploma in Business Administration from the same institution in 1986.

He was first elected to the legislature in the election of 1990, defeating New Democrat Dale Hamilton by about 1,300 votes. He was re-elected with a much greater majority in the 1995 election, in which the Progressive Conservatives formed a majority government.

During the 1995 campaign, Arnott was the only Progressive Conservative candidate who refused to sign an election pledge not to increase taxes without a provincial referendum. Not surprisingly, he was not appointed to Mike Harris's cabinet after the election.

He was again re-elected with a large majority in the election of 1999. Again, he was not appointed to cabinet in the governments of Harris and Ernie Eves.

Arnott describes himself as a "moderate conservative", and endorsed John Tory's bid for the party leadership in 2004.