Jack Andrew Lowden (born 1990) is a Scottish actor. Following a four-year stage career, his first major international onscreen success was in the 2016 BBC miniseries War & Peace, which led to starring roles in feature films. Starring as River Cartwright in the Apple TV series Slow Horses since 2020, he has received nominations for a Primetime Emmy Award and a Golden Globe Award. 

Lowden starred as Eric Liddell in the 2012 play Chariots of Fire in London. In 2014, he won an Olivier Award and the Ian Charleson Award for his role as Oswald in Richard Eyre's 2013 adaptation of Ibsen's Ghosts. 

In 2013, he began to take on substantial roles in British television series and feature films, including The Tunnel (2013) and '71 (2014). He also had leading roles in the BBC miniseries The Passing Bells (2014) and War & Peace (2016). Other screen roles include the title role as golfing legend Tommy Morris in Tommy's Honour (2016); the starring role of Morrissey in the biopic England Is Mine (2017); a main-cast role as an RAF fighter-pilot in Christopher Nolan's Dunkirk (2017); a starring role in the Scottish Highlands thriller Calibre (2018, for which he won the British Academy Scotland Award for Best Film Actor); Lord Darnley in Mary Queen of Scots (2018); a starring role as a plantation owner in 19th-century Jamaica in the 2018 BBC miniseries The Long Song; and as Zak "Zodiac" Bevis in the 2019 comedy-drama WWE film Fighting with My Family.

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