John McCallister (born 20 February 1972) is a Northern Irish Unionist politician.
In 2007, he was elected to the Northern Ireland Assembly as an Ulster Unionist Party (UUP) member for South Down.
On 14 February 2013, McCallister announced that he had resigned from the UUP due to its decision to engage in an electoral pact with the Democratic Unionist Party.
He was a co-founder of the NI21 party with fellow ex-UUP member Basil McCrea but resigned the following year following disputes with McCrea.
He re-contested his seat as an Independent at the 2016 election but lost his seat, receiving just 2.8% of the vote.