Antonie Frederik Jan Floris Jacob Baron van Omphal, MWO (2 May 1788 – 8 July 1863) was a Dutch lieutenant-general and extraordinary aide-de-camp to William III of the Netherlands.

Antonie Frederik Jan Floris Jacob van Omphal was born on 2 May 1788 in Tiel in the Dutch Republic.

He was a son of Diederik van Omphal, lord of IJzendoorn (1752–1813), and his second wife Wilhelmina Anna Cornelia de Pagniet (1765–1806).

He was noted for his courage during the Battle of Leipzig (16–18 October 1813); at the time he was a first lieutenant for the second regiment of lancers of the Imperial Guard of Napoleon I.

The two had been friends for many years; Wellington had held an annual banquet every 18 June commemorating Waterloo, which Van Omphal had always attended.