Esthwaite Water

Infobox lake
lake_name = Esthwaite Water
image_lake =
caption_lake =
image_bathymetry = Esthwaite Watermap.jpg
caption_bathymetry = Map (1925)
location = Lake District, Cumbria
coords = coord|54|21|N|2|59|W|region:GB_type:waterbody|display=inline,title
type =
inflow =
outflow =
catchment =
basin_countries = United Kingdom
length =
width =
area = convert|280|acre|km2|1|abbr=on|lk=on
depth = convert|6.4|m|ft|1|abbr=on|lk=on
max-depth = convert|15.5|m|ft|1|abbr=on|lk=on
volume =
residence_time = 0.26 years
shore =
elevation = convert|65.3|m|ft|0|abbr=on|lk=on
islands = 1
cities =

Esthwaite Water is one of the smaller and less well-known lakes in the Lake District national park in northern England. It is situated between the much larger lakes of Windermere and Coniston Water, in the traditional county of Lancashire; since 1974 in the administrative county of Cumbria. To the north is the village of Hawkshead and to the west is Grizedale Forest.

The lake covers around convert|280|acre|km2|1 and is known for its excellent fishing, particularly trout and pike. It has been designated as a site of special scientific interest.

The lake was mentioned as the location where William Wordsworth conversed with a friend in Wordsworth's poem, "Expostulation and Reply," part of Wordsworth's Lyrical Ballads. Wordsworth also mentions it in his Prelude of 1805 at line 570: "From Esthwaite's neighbouring lake the splitting ice".