The NatWest Women's Quadrangular Series was a Women's One Day International series which took place in England in 2011. The top four ranked teams in the world competed: Australia, England, India and New Zealand. The tournament consisted of a round-robin group stage, in which Australia and England finished as the top two, and then a third-place play-off and a final were contested to decide the final positions. England defeated Australia by 34 runs in the final. The tournament followed a Twenty20 Quadrangular Series, with the same teams competing.