Eighteen Mile Creek, or Eighteenmile Creek, is a tributary of Lake Ontario located entirely in Niagara County, New York in the United States. The name of "Eighteen Mile" Creek refers not to the length of the creek, but to its distance from the Niagara River to the west. Originating just north of City of Lockport in the Town of Lockport, it travels approximately 26 miles (42 km) northward, winding through the Town of Newfane. A dam by the community of Burt forms a widening of the creek as far upstream as the community of Newfane. Eighteen Mile Creek enters Lake Ontario at Olcott harbor.