Michael Spencer

The Right Honourable
The Lord Spencer of Alresford
The Right Honourable The Lord Spencer of Alresford
	Official portrait, 2025
Member of the House of Lords
	Lord Temporal
	Life peerage ; 17 September 2020
Personal details
Born	30 May 1955; Kuala Lumpur, British Malaya
Party	Conservative
Spouse(s)	Lorraine Spencer (div. 2008) ; Sarah Mountbatten, Marchioness of Milford Haven (m. 2016)
Children	3, including Patrick
Occupation	Financial broker; investor;
Known for	ICAP, ICAP Charity Day, political fundraising

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Michael Alan Spencer, Baron Spencer of Alresford (born 30 May 1955), sometimes known as "Spence", is a British billionaire businessman and philanthropist. He is the founder of NEX Group, a UK-based business focused on electronic markets and post-trade business which was acquired by CME Group in November 2018. NEX Group was formerly known as ICAP, until the sale of its voice-broking business to Tullett Prebon in December 2016.

Spencer was described in 2018 as the richest self-made person in the City of London and a "City grandee". According to the Sunday Times Rich List in 2021, he is worth an estimated £1.2 billion. He was awarded a peerage in August 2020 in the Political Honours List.

He is the father of Patrick Spencer, MP for Central Suffolk and North Ipswich.