McKinstry is a surname. Notable people with the surname include:
Alexander McKinstry (1822–1879), American politicianChris McKinstry (1967–2006), Canadian artificial intelligence researcherElisha W. McKinstry (1824–1901), American juristHenry McKinstry, Canadian mayorJames A. McKinstry (born 1942), American football playerJames McKinstry (born 1979), Scottish footballerJohn McKinstry, Canadian musician and singerLeo McKinstry (born 1962), Northern Irish writer and journalistNancy McKinstry (born 1959), American businesswoman