Arthur Rosser JP (16 April 1864 – 15 February 1954) was a notable New Zealand builder, local-body politician and trade unionist.

[1] After he was blacklisted by conservative building contractors due to his links with the Liberal Party, Rosser took up a new career as a union organiser, the first in Auckland.

[1] Within twelve years he was involved in the formation of nine new trade unions and was himself the secretary of many of them, demonstrating a skill for arbitration.

This came to a head in 1910, when he was replaced as the president of the Auckland Trades and Labour Council by the more radical Michael Joseph Savage.

He was unexpectedly denied re-nomination by the Labour Party alongside sitting councillors Ted Phelan and George Gordon Grant.