Eastern Ontario Senior Hockey League

Founded	2003
First season	2003–04
Folded	2008
Most successful club	Whitby Dunlops

The Eastern Ontario Senior Hockey League, or EOSHL, was a top Senior ice hockey league in Eastern Ontario. The league was governed by the Ontario Hockey Association, but was merged into the Major Hockey League in 2008.

The EOSHL became a sanctioned Senior "A" league in 2003. In 2005, the league was promoted to Senior "AAA" to compete against the Major League Hockey (MLH) league and have a chance to win the Allan Cup. In 2006, the league dropped from six to four teams.

During the 2007-08 season, a new team known as the Cooks Bay Canucks joined the league. What ensued with this franchise his quite original, as the team, although successful on the ice, underwent two name changes in the same season. The team started the season as the Cooks Bay Canucks, but soon dropped it for the Simcoe County Canucks. Although that does not sound too strange, the Canucks made the playoffs and before game two of the league semi-final announced another name change to the Simcoe County Tundras, with new logos, and completely different jerseys and team colours.

In May 2008, due to major team losses in the MLH leaving the western league with two teams, the EOSHL and the MLH merged to operate as Major League Hockey. The league subsequently changed its name to Allan Cup Hockey.

Bolded teams were the winners of the Robertson Cup as Ontario Hockey Association champions.

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