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:
- announcement of the 150 icons of Queensland by the Queensland Premier Anna Bligh 
- placement of a time capsule in the grounds of Old Government House
- the creation of monuments at significant survey points in Queensland's history by the Surveying and Spatial Sciences Institute to honour the many early explorer/surveyors who mapped the state
- the State Library of Queensland collected stories from notable Queenslanders, as part of the Storylines - Q150 digital stories project.
- "Queensland turns 150 in 2009". Q150. Queensland Government. Archived from the original on 15 December 2009. Retrieved 14 July 2014.
- Bligh, Anna (10 June 2009). "Premier unveils Queensland's 150 icons". Media Statements. Queensland Government. Retrieved 14 July 2014.
- "Q150 icons list". Brisbane Times. 10 June 2009. Retrieved 14 July 2014.
- Robertson, Stephen (24 June 2009). "Q150 honours Queensland's earliest explorers". Media statements. Queensland Government. Retrieved 14 July 2014.
- "About SSSI Q150 Project". Surveying and Spatial Sciences Institute Q150. Surveying and Spatial Sciences Institute. Archived from the original on 5 June 2014. Retrieved 14 July 2014.
- Maeseele, Melanie (29 September 2009). "History on display in new mural". Queensland Times. Retrieved 11 February 2015.