Grasmere is a suburb of the Macarthur Region of Sydney in the state of New South Wales, Australia in Camden Council.

In 1805, wool pioneer John Macarthur was granted 5,000 acres (20 km2) at Cowpastures (now Camden).

The majority of people were born in Australia and the most common ancestries were English, Australian and Irish.

[1] Grasmere lies in the south ward of Camden Council, currently represented by Chris Patterson (who is also the Mayor of Camden), Eva Campbell and Fred Whiteman.

It sits within the state electorate of Camden, represented by Labor's Geoff Corrigan, the former Mayor of Camden, and the federal electorate of Macarthur, represented by Liberal's Pat Farmer, the former ultra-marathon runner.