James To Kun-sun (; Chinese: ???; born 11 March 1963) is a Hong Kong lawyer and the Democratic Party member of the Legislative Council of Hong Kong representing the District Council (Second) constituency.
James To has also been a member of the Yau Tsim Mong District Council.
Since 2016, To is the most senior member in the Legislative Council.
He is also the convenor of the pro-democracy caucus in the Legislative Council from 2016–17.