Liptó County (Hungarian: Liptó vármegye, Latin: Comitatus Liptoviensis, Slovak: Liptovská župa, German: Komitat Liptau, Polish: Komitat Liptów) was an administrative county (comitatus) of the Kingdom of Hungary. Its territory is now in northern Slovakia.

Liptó county shared borders with the Austrian land Galicia and the Hungarian counties Árva, Turóc, Zólyom, Gömör-Kishont and Szepes. The county's territory was situated along the upper Vág (present-day Váh) river between the High Tatras and the Low Tatras. Its area was 2,247 km around 1910.

Today, the territory of the former Liptó County largely corresponds to the Ružomberok District and Liptovský Mikuláš District in northern Slovakia. Three villages (Liptovská Teplička, Štrba and Štrbské Pleso) are now in the Poprad District.

The capitals of the county were the Liptó Castle, later Németlipcse (present-day Partizánska Ľupča), and since 1677 the capital was Liptószentmiklós (present-day Liptovský Mikuláš).

Liptó county as a Hungarian comitatus arose before the 15th century. At various points throughout history the county was ruled by Voivodes or Counts from the Rosenberg, Csák and Benyovszky families. In the aftermath of World War I, the area became part of newly formed Czechoslovakia, as recognized by the concerned states in 1920 by the Treaty of Trianon.

Population by mother tongue

Census	Total	Slovak	Hungarian	German	Other or unknown
1880	74,758	67,554 (93.67%)	1,438 (1.99%)	2,775 (3.85%)	353 (0.49%)
1890	76,850	72,067 (93.78%)	1,771 (2.30%)	2,568 (3.34%)	444 (0.58%)
1900	82,159	75,938 (92.43%)	2,708 (3.30%)	2,475 (3.01%)	1,038 (1.26%)
1910	86,906	78,098 (89.86%)	4,365 (5.02%)	2,591 (2.98%)	1,852 (2.13%)

Population by religion

Census	Total	Roman Catholic	Lutheran	Jewish	Other or unknown
1880	74,758	38,601 (51.63%)	32,735 (43.79%)	3,349 (4.48%)	73 (0.10%)
1890	76,850	40,149 (52.24%)	33,408 (43.47%)	3,137 (4.08%)	156 (0.20%)
1900	82,159	43,979 (53.53%)	34,953 (42.54%)	3,092 (3.76%)	135 (0.16%)
1910	86,906	47,772 (54.97%)	35,169 (40.47%)	3,237 (3.72%)	728 (0.84%)

In the early 20th century, the subdivisions of Liptó County were:

Districts (járás)
District	Capital
Liptószentmiklós	Liptószentmiklós (now Liptovský Mikuláš)
Liptóújvár	Liptóújvár (now Liptovský Hrádok)
Németlipcse	Németlipcse (now Partizánska Ľupča)
Rózsahegy	Rózsahegy (now Ružomberok)
Urban districts (rendezett tanácsú város)
Rózsahegy (now Ružomberok)