Robert Herbert "Bert" Lacey (12 January 1900 – 2 November 1984) was an Australian politician.
Born in Maryborough, Victoria, Lacey was educated at state schools and then at Wendouree Agricultural College in Ballarat.
Having moved to Tasmania, he was an organiser of the state's Australian Workers' Union 1938–1946 and Secretary of the Tasmanian Labor Party 1947–1965.
In January 1959, he was elected in a countback as Labor member for Denison in the Tasmanian House of Assembly, replacing Alfred White who had been appointed Agent-General in London.
The parliament was prorogued before Lacey took his seat in the chamber, and he was defeated at the state election in May that year.