Nicolai Jonathan Meinert (9 March 1791 – 26 February 1877) was a Danish businessman and politician.
In 1843. he was a co-founder of Selskabet for dansk undervisnings fremme i Nordslesvig and of Den slesvigske Hjælpeforening (Syvstjernen).
Her parents were the owner of Nørre Vosborg Niels Kjær Tang (1767–1814) and Marie Cathrine Meinert (1776–1855).
His wife's mother was after the death of her husband married to provost and later Bishop of Ribe Conrad Daniel Koefoed (1763–1831).
At the time of the 1840 census, Nicolai Jonathan Meinert and his wife resided on the first floor of Strandgade 12 with their 10 children (aged seven to 21) and three maids.