Lačný (feminine: Lačná) is a Slovak surname. Notable people with this surname include:
Ľudovít Lačný (born 1926), Slovak chess problem composer and judge Miloš Lačný (born 1988), Slovak footballer
See also
Lacny, a chess problem theme named after Ľudovít Lačný Lačna Gora, Slovenia Lačen, a Slovenian surname