The 2005 Allan Cup was the Canadian senior ice hockey championship for the 2004–05 senior "AAA" season. The event was hosted by the Lloydminster Border Kings in Lloydminster, Saskatchewan/Alberta. The 2005 tournament marked the 97th year that the Allan Cup has been awarded.

This Allan Cup coincided with the 2004-05 NHL lockout which had wiped out the entire 2004-05 NHL season including the Stanley Cup Playoffs. As a result, the tournament enjoyed considerably more media coverage compared to what is typically devoted to the Allan Cup. Among the participants involved was Theoren Fleury,^[1] a former National Hockey League all-star, playing for the Horse Lake Thunder during the lockout.

• Can-Am Cobras (Atlantic)
• Horse Lake Thunder (Pacific)
• Lloydminster Border Kings (Host)
• Mid-West Islanders (West)
• Montmagny Sentinelles (Quebec)
• Thunder Bay Bombers (Ontario)

Round Robin

Mid-West Islanders 8 - Thunder Bay Bombers 3

Lloydminster Border Kings 7 - Can-Am Cobras 0

Montmagny Sentinelles 5 - Thunder Bay Bombers 2

Horse Lake Thunder 9 - Lloydminster Border Kings 2

Horse Lake Thunder 7 - Can-Am Cobras 2

Montmagny Sentinelles 6 - Mid-West Islanders 2

Quarter-final

Mid-West Islanders 4 - Can-Am Cobras 3

Thunder Bay Bombers 5 - Lloydminster Border Kings 0

Semi-final

Thunder Bay Bombers 7 - Horse Lake Thunder 5

Montmagny Sentinelles 4 - Mid-West Islanders 1

Final

Thunder Bay Bombers 4 - Montmagny Sentinelles 3

• 2005 Allan Cup website
• Allan Cup website