Sienna Tiggy Guillory is an English actress and former model. She portrayed Jill Valentine in several entries of the Resident Evil action-horror film series. Other prominent roles include elf princess Arya Dröttningu in the fantasy-adventure film Eragon, and the title role in the TV miniseries Helen of Troy. She has appeared in TV shows including Fortitude, Stan Lee's Lucky Man, and Luther.

Jill Valentine is a character in Resident Evil, a survival horror video game series created by the Japanese company Capcom. She was introduced as one of the two player characters in the original Resident Evil (1996), alongside her partner Chris Redfield, as a member of the Raccoon City Police Department's Special Tactics And Rescue Service (S.T.A.R.S.) unit. Jill and Chris fight against the Umbrella Corporation, a pharmaceutical company whose bioterrorism creates zombies and other bio-organic weapons, and later become founding members of the United Nations' Bioterrorism Security Assessment Alliance (BSAA).