Waterloo is an area of the Metropolitan Borough of Sefton, in Merseyside, England. Along with Seaforth the two localities make up the Sefton Ward of Church. The area is bordered by Crosby to the north, Seaforth to the south, the Rimrose Valley country park to the east, and to the west the Crosby Beach and Crosby Coastal Park.
Crosby Beach begins in Waterloo at the Crosby Marine Park and stretches 3 miles up to Hightown and is the location of Antony Gormley's Another Place.
The area is connected to Liverpool in the south and Southport to the north by Merseyrail Northern line at Waterloo railway station.