Ján Kollár (29 July 1793 in Mošovce (Mosóc), Kingdom of Hungary, Habsburg Monarchy, now Slovakia – 24 January 1852 in Vienna, Austrian Empire) was a Slovak writer (mainly poet), archaeologist, scientist, politician, and main ideologist of Pan-Slavism.

He studied at the Lutheran Lyceum in Pressburg (Pozsony, Kingdom of Hungary, now Bratislava,Slovakia). He spent most of his adult life as a chaplain to the populous but poorSlovak Lutheran community in Pest (Kingdom of Hungary, today part of Budapest, Hungary). From 1849, he was a professor of Slavic archeology at the University of Vienna, and several times he also acted as a counselor to the Austrian government for issues around the Slovaks. He entered the Slovak national movement in its first phase.

His museum (since 1974) in Mošovce was installed in the former granary, which was the only masoned part of Kollár's otherwise wooden birth-house. The rest of the house burned down in a fire on 16 August 1863. In 2009 was built a replica of the original Kollár's birth-house, which is now a museum.