Luke Thompson grew up in France from the age of 2, but was born in Southampton, UK. He speaks French and English. His father was an engineer and his mother a teacher , and he is one of three children. He attended a French school in Fontainebleau with an Anglophone Section from 1997 to 2005. Arriving in the UK in 2006, Thompson spent a year with the Year Out Drama Company in Stratford-upon-Avon. He studied English and Drama at the University of Bristol and trained at the Royal Academy of Dramatic Art in London, graduating in 2013.