Sir Otto Moses Jaffe, JP (13 August 1846 – 29 April 1929), also spelt Jaffé, was a German-born British businessman, who was twice elected Lord Mayor of Belfast and was a leader of the Jewish community in the city.

Daniel Jaffe along with his older sons, Martin, John and Alfred, set up a business exporting linen.

Otto was educated at Mr Tate's school in Holywood, County Down, and later in Hamburg and Switzerland.

Even though he was loyal to the Crown, and his eldest son Arthur and his nephew were serving in the British Army, Sir Otto was accused of being a German spy.

[9] Society women refused support for the Children's Hospital so long as Jaffe and his wife remained on the board.

In a letter to the Northern Whig newspaper in May 1915, Sir Otto stated: "how anyone who has any knowledge of me and my life would think that I could approve of the horrible and detestable actions of which she (Germany) has been guilty is almost beyond my comprehension.

In 1933 it was moved to the Botanic Gardens, but in 2008 was restored and returned close to its original site in Victoria Square opposite the Old Town Hall.

[12] There is also a blue plaque on the side of the Ten Square Hotel at the top of Linenhall Street in Belfast, placed there by the Ulster History Circle marking where his office was located.

Known relative in North America High Sheriff aka Lord Mayor Sir David Jaffe of the Highland Village Area