| Betty Kiernan | |
| Constituency Am1: | Mount Isa |
| Assembly1: | Queensland Legislative |
| Term Start1: | 9 September 2006 |
| Term End1: | 23 March 2012 |
| Predecessor1: | Tony McGrady |
| Successor1: | Robbie Katter |
| Birth Date: | 27 August 1955 |
| Birth Place: | Mount Isa, Queensland, Australia |
| Nationality: | Australian |
| Party: | Labor |
| Occupation: | Company director |
Betty Margaret Kiernan (born 27 August 1955) is an Australian politician. Born in Mount Isa, Queensland, she was an electorate officer and corporate manager before entering politics, and had served on Cloncurry Shire Council from 1981 to 1990. A member of the Labor Party, she was elected to the Legislative Assembly of Queensland in 2006 as the member for Mount Isa.
She lost her seat in the 2012 state election amid Labor's collapse that year, being pushed into third place on the primary vote, behind winner Robbie Katter of Katter's Australian Party and the Liberal National candidate.