Q150 was the sesquicentenary (150th anniversary) of the Separation of Queensland from New South Wales in 1859. Separation established the Colony of Queensland which became the State of Queensland in 1901 as part of the Federation of Australia. Q150 was celebrated in 2009.

The Queensland government and other Queensland organisations celebrated the occasion with many events and publications, including:

Many local communities celebrated Q150 in various ways. In Coominya, the local heritage society commissioned a series of murals depicting early life at the town.