Simon Armstrong is a Welsh actor from Llanelli, best known for his portrayal of Qhorin Halfhand in Game of Thrones. Armstrong portrayed Qhorin Halfhand in the HBO series Game of Thrones (2012).

He also had recurring roles in the TV series Coronation Street (2013) and The Interceptor (2015). He portrayed Rogers in Nigel Cole's Made in Dagenham (2010). He starred in the Dutch crime action comedy Black Out (2012) and in the British drama film In the Dark Half (2012).