Ken Armstrong may refer to:
- Ken Armstrong (footballer, born 1924) (1924–1984), Chelsea F.C. footballer, and English and New Zealand dual-international
- Ken Armstrong (footballer, born 1959), English-born footballer who played with among others Kilmarnock F.C. and Birmingham City F.C.
- Ken Armstrong (journalist), American journalist
- Ken Armstrong (motorcycle racer), Grand Prix motorcycle racer from Great Britain
- Ken Armstrong (Australian footballer) (1936–2009), Australian rules football player and coach for Perth and later commentator
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