Ingrid Ann Simler, Lady Simler, DBE, PC (born 17 September 1963) is a Justice of the Supreme Court of the United Kingdom. She was previously a judge of the Court of Appeal of England and Wales.^[1]

Born to a Jewish family, she was educated at Henrietta Barnett School, Sidney Sussex College, Cambridge and the University of Amsterdam.^[2]

She was called to the bar by Inner Temple in 1987 and became a QC in 2006. Simler was appointed a Recorder in 2002 and was a judge of the High Court of Justice (Queen's Bench Division) from 2013. She was President of the Employment Appeal Tribunal for a term of three years from 1 January 2016 to 31 December 2018.^{[3][dead link]}

On 27 June 2018, it was announced that Simler was to be appointed to the Court of Appeal (England and Wales), an appointment she took up on 2 July 2019.^[4]

Simler was chair of the Equality and Diversity Committee of the Bar Council of England and Wales,^[5] and at the date of announcement of her appointment to the High Court bench in 2013 she was head of her chambers.^[6] She is the chair of the Equality, Diversity and Inclusion sub-committee of the Inner Temple.^[7]

On 17 October 2023, the Ministry of Justice announced that Simler would become a Justice of the Supreme Court of the United Kingdom.^[8] She was sworn in on 14 November 2023.^[9]

• Mercer v Alternative Future Group Ltd [2024] UKSC 12
• Kostal UK Ltd v Dunkley [2018] ICR 768 (EAT)