Rainworth Water is a watercourse that is a tributary of the River Maun near Rainworth, Nottinghamshire, England. It is characterised by a number of lakes, including that which forms part of the country park at Rufford Abbey. L Lake at Rainworth forms part of the Rainworth Lakes Site of Special Scientific Interest. There are two designated Local Nature Reserves along its length, one of which is also known by the name Rainworth Water.