The service begins at 5.30pm at St Lawrence Jewry, Guildhall Yard, London, EC2V 5AA.
Carols will be followed by mulled wine and mince pies across the road at Commerzbank's offices.
The event will raise funds and awareness for Marie Curie Cancer Care, a charity which provides care and support for people living with any terminal illness, and their families.
To make an online donation visit www.justgiving.com/LSMFCarolConcert2015 and you will be sent your ticket for the event.