Ioan N. Lahovary or Ion Lahovari; January 25, 1844 – June 14, 1915) was a member of Romanian aristocracy, a politician and diplomat who served as the Minister of Foreign Affairs of Romania.

Ioan Lahovary was the brother of Alexandru Lahovary, who also previously served as foreign minister and General Iacob Lahovary who was his predecessor in the post of Minister of Foreign Affairs and later Minister of War.

Lahovary served two terms as foreign minister: from April 11, 1899, until July 6, 1900, in the Gheorghe Gr.

Ioan Lahovary died on June 14, 1915, in Bucharest.

Among them was Princess Marthe Bibesco, a famous Romanian writer.