Sir Thomas Reginald Groom (1906–1987) was Lord Mayor of Brisbane in Queensland, Australia from 1955 to 1961.

In 1943, he entered local politics as a Citizens' Municipal Organisation councillor in the Brisbane City Council.

Despite severe budget restrictions he attempted to improve the city's infrastructure, particularly the water, electricity, and sewer networks.

Following electoral defeat, Groom was knighted in 1961 and returned to a career in accountancy and business.

As well as running his own accountancy firm, during the 1960s and 1970s he served as chairman of Mount Isa Mines, P&O Australia and the Commonwealth Bank, amongst others.