Lorna Watson (born 1977) is a British comedian, actress and television presenter. She was one of the presenters of Spy School. Her acting roles include various characters in television sketch shows Rush Hour, The Wrong Door and Watson & Oliver with comedy partner Ingrid Oliver.

In March 2012 she appeared on Let's Dance for Sport Relief with Ingrid Oliver; they danced to Ravel's Boléro. The two met at Tiffin Girls' School in Kingston upon Thames. Her influences are French & Saunders and Fry & Laurie.

In 2013, Watson appeared as Sister Boniface in the Father Brown episode "The Bride of Christ" and took part in a special series of The Great British Bake Off. In 2015, she starred in a special episode of Horrible Histories in which she played Boudicca. She also played a one-off character called 'Thingy' in the 'Fashion Phonies' episode of CBBC's Hotel Trubble.

In January 2020, it was announced that Watson would be reprising her Sister Boniface role for a new series called Sister Boniface Mysteries, with a ten-episode first series premiering on the streaming service BritBox. The second series aired in 2023 with filming for a third series beginning in June for broadcast in 2024, with Watson also recording a return to Father Brown