Antoinette Geraldine Mackeson-Sandbach, known as Antoinette Sandbach, is a barrister, farm manager and politician who was elected as a North Wales region Member of the Welsh Assembly at the May 2011 election, and subsequently elected Member of Parliament for Eddisbury in Cheshire at the 2015 general election.

The 2011 National Assembly for Wales election was an election for the National Assembly. The poll was held on 5 May 2011 and decided the incumbency for all the Assembly's seats. It was the fourth election for seats in the National Assembly for Wales, and the second election taken under the rules of the Government of Wales Act 2006.