Thomas Brindle was a New Zealand activist for the New Zealand Labour Party who was jailed during World War I for speaking out against conscription. He was a member of Wellington City Council and stood for election to the House of Representatives five times. He was a member of the Legislative Council from 1936 until March 1950.

The Social Democratic Party of New Zealand was an early centre-left to left-wing political party. It existed only a short time before being amalgamated into the new Labour Party. During its period of existence, the party held two seats in Parliament.