Patrick Spiller is a fictional character from the BBC medical drama Casualty, portrayed by actor Ian Kelsey.

Patrick is a specialist registrar in the Holby City Hospital emergency department, who attempts to advance his career and attain a consultancy post, whilst having relationships throughout his tenure with SHO Holly Miles, PC Rachel James and Holly's replacement, SHO Lara Stone.

He dies from a head injury following a car crash in the sixteenth series episode "Past, Present, Future" – making his final appearance on 16 March 2002.

"[1] Patrick has been described as "Casualty's bad boy" by Marion McMullen of the Coventry Telegraph, who deemed him "arrogant, brusque and bad-tempered".

[4] Writers created a fictional backstory for Patrick and Senior House Officer Holly Miles (Sandra Huggett), which is revealed when they meet again.

[8] Patrick has an arrogant attitude, which leads to staff nurse Lisa Duffin (Cathy Shipton) reprimanding him,[9] and sees him invited to work a shift with the paramedics after dismissing their importance.

[11] He and hospital porter Spencer (Ben Keaton) are held hostage when they become involved in a family feud, but manage to escape unharmed.

[14] Holly leaves following her ordeal, and Patrick begins dating married policewoman Rachel James (Amy Robbins).

He shows an interest in the department's new SHO Lara Stone,[15] who invites him to a Halloween party, but stands him up upon learning that he is already in a relationship.

[24] Charlie Catchpole of the Daily Mirror was keen to see a television doctor who did not like people and cited Patrick as an example.