Lomnice nad Popelkou (German: Lomnitz an der Popelka) is a town in Semily District in the Liberec Region of the Czech Republic.

The historic town centre is well preserved and is protected by law as an urban monument zone; the local town part of Karlov is protected as a village monument reservation.

[3] Lomnice nad Popelkou is located about 33 kilometres (21 mi) southeast of Liberec.

Due to the harsh climatic conditions, Lomnice area was colonized at the turn of the 12th and 13th centuries.

From 1524 to 1654, the town was owned again by the Waldstein family and experienced a time of greatest prosperity and development.

[7] Lomnice nad Popelkou is the starting point of the railway lines to Městec Králové and Stará Paka.

[9] The most valuable part of the town is Karlov, formed by Karlovské Square and its closest surroundings.