Michael O'Brien is a Canadian politician, who was elected mayor of Fredericton, New Brunswick in the 2016 municipal election.

[1] He defeated incumbent mayor Brad Woodside.

[1] Prior to winning the mayoralty, O'Brien served on Fredericton City Council as a city councillor from 2001 to 2016.

[1] A professional engineer, he most recently worked for NB Liquor, including a period as interim president and CEO.

[1] In 2021, he lost the municipal election to former Ward 11 city councillor Kate Rogers.