The 2005 Ms. Olympia contest is an IFBB professional bodybuilding competition and part of Joe Weider's Olympia Fitness & Performance Weekend 2005 was held on October 14-15, 2005, at the South Hall in the Las Vegas Convention Center in Winchester, Nevada and in the Orleans Arena at The Orleans Hotel and Casino in Paradise, Nevada.

Total: $71,000[1] Comparison to previous Olympia results: The IFBB introduced the so-called '20 percent rule', requesting "that female athletes in Bodybuilding, Fitness and Figure decrease the amount of muscularity by a factor of 20%".

The memo stated that the request "applies to those female athletes whose physiques require the decrease".

Another change added to the 2005 Ms. Olympia, was the abandonment of the weight class system adopted in 2000.

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