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Another death occurred on Walt Disney World property Sunday, TMZ has learned ... and this marks the fourth one in a month.

Florida's Orange County Sheriff's Office tells TMZ ... "A woman in her 40s was transported to Celebration Hospital where she passed away." Gallery Launch Gallery Getty

We're told there were no signs of foul play.

As we reported ... there were three previous deaths at Walt Disney World over the last month -- two of which were apparent suicides. Getty

A 31-year-old woman died by suicide at Disney's Contemporary Resort October 14, then a week later, a man in his 60s died after suffering a medical episode at Disney's Fort Wilderness Resort and Campground. Last week, another death was reported -- the suicide of a 28-year-old man identified as Matth

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