World of Warcraft subs now stand at 6.8 million as of June 30 according to Activision.
That's approximately 800,000 less than reported three months ago.
The figures were revealed in the firm's latest financial results and attributed the decline in subscribers quarter over quarter, as being "disproportionately concentrated in the East."
The firm said this was similar to the seasonal decline experienced during the second quarter of 2012, prior to the launch of the most recent expansion later that year.
Blizzard will announce the release date for its World of Warcraft expansion Warlords of Draenor on August 14.