John Thomas Dumbell (1859 – 31 December 1936) was a New Zealand rugby union player.

[3] In 1884 Dumbell was included in the first New Zealand team, which toured New South Wales and played five matches.

With poor weather conditions the New Zealand team battled on securing the game 29–0.

Dumbell had ended up with nine points for the tour, scoring a try and a drop goal in the last match.

[3] After his retirement from playing Dumbell served the Wellington union as a management committee member, selector and representative referee.