200px|thumb|Edmund Allenby, <br /> 1st Viscount Allenby
Viscount Allenby, of Megiddo and of Felixstowe in the County of Suffolk, is a title in the Peerage of the United Kingdom. It was created on 7 October 1919 for the prominent military commander Field Marshal Sir Edmund Allenby, with remainder, in default of male issue of his own, to his younger brother Captain Frederick Claude Hynman Allenby and his heirs male lawfully begotten. The first Viscount's son was killed in action on the Western Front in 1917. .
The first Viscount was succeeded according to a special remainder by his nephew Captain Frederick Allenby, the second Viscount. The latter's son, the third Viscount, who succeeded in 1984 was one of the ninety elected hereditary peers that remain in the House of Lords after the passing of the House of Lords Act 1999, and sat as a crossbencher. , the title is held by his son, the 4th Viscount, who succeeded in 2014. They have two sons, Harry Michael Edmund Allenby (born 2000, heir apparent) and Charles Michael James Allenby (born 2004).
Allenby owns a company which manages woodlands and hedgerows. In December 2017, he was a guest of honour at the Tower of David Museum in Jerusalem, which staged a commemoration of General Allenby's capture of the city in 1917. He commented "To understand about Field Marshal Allenby you have to go to a museum. There were no movies made about him, as there were about Lawrence of Arabia."