Lake Rubikiai

infobox_lake
lake_name = Rubikiai
image_lake =
caption_lake =
location = Anykščiai district municipality
type = natural
inflow =
outflow = Anykšta rivulet
area = convert|9.4|km2|mi2|abbr=on
volume =
depth = convert|5.7|m|ft|abbr=on
max-depth = convert|16|m|ft|abbr=on
elevation =
residence_time =
shore = convert|24|km|mi|abbr=on
coords = coord|55|30|22|N|25|16|59|E|region:LT_type:waterbody|display=inline,title
cities = Rubikiai
islands = 13-16 (Pertako, Bučinė, Aukštoji, Česnakinė, Liepinė, Didžioji)
reference =
basin_countries = Lithuania

Lake Rubikiai is a lake in Anykščiai district municipality, Lithuania. It is famous for its 13 (or 16) islands (Pertako, Bučinė, Aukštoji, Česnakinė, Liepinė, Didžioji, and others) that cover 1.1 km². Among the settlements located on the shores of the lake, Rubikiai town is the largest. Anykšta rivulet, the namesake of Anykščiai and left tributary of Šventoji River, flows from the lake. In 1960 Lake Rubikiai was declared a landscape reserve and now is part of Anykščiai Regional Park. There are several campsites where tourists are welcome to put up tents or rent kayaks. Every year since 1984 Lake Rubikiai hosts a regatta on the Joninės day.