Janet Trafton Mills (born December 30, 1947) is an American politician and lawyer serving as the 75th governor of Maine since January 2019.

A member of the Democratic Party, Mills was first elected attorney general by the Maine Legislature on January 6, 2009, succeeding G. Steven Rowe.

Her party nominated her for governor in the 2018 election, and she won, defeating Republican Shawn Moody and independent Terry Hayes.

As a teenager, she spent nearly a year bedridden in a full-body cast due to severe scoliosis, which was corrected surgically.

[6] Mills briefly attended Colby College before moving to San Francisco,[3] where she worked as a nursing assistant in a psychiatric hospital.

[3] Mills was appointed as Maine's first female criminal prosecutor by Governor Joe Brennan,[8] and was an assistant attorney general from 1976 to 1980, prosecuting homicides and other major crimes.

[9][10] In 1994, Mills was an unsuccessful candidate for the United States Congress in the Democratic primary to replace then-Representative Olympia Snowe.

LePage did so after Mills twice declined to represent him in matters she determined had little legal merit, though she approved his requests for outside lawyers.

[23] One of several candidates in the primary, she won the nomination in June, finishing first after four rounds of ranked-choice voting gave her 54% to her closest competitor's 46%.

[25] Mills's campaign was aided in part by a Democratic super PAC that financed Maine-themed ads meant to attract young voters on social media.

[30][31] One of Mills's first acts as governor was to sign an executive order to carry out the expansion of Maine's Medicaid program as called for by a 2017 referendum, something LePage had refused to do.

[32] Mills also dropped work requirements for Medicaid that LePage requested toward the end of his tenure and that had the Trump Administration's approval.

[33] Mills revived the tradition of Maine governors attending Martin Luther King Jr. Day commemoration events in Portland, doing so in 2019.

[34] In September 2019, United Nations Secretary-General António Guterres asked Mills to speak at the General Assembly on climate change.

[39] On June 24, 2021, Mills vetoed seven bills, including one that would have closed the Long Creek Youth Development Center, a juvenile prison.

[40] On April 20, 2022, Mills signed into law the Maine state supplemental budget, which included free community college for students of the class of 2020, 2021, 2022 and 2023.

In May 2019, she signed a bill banning conversion therapy, the pseudoscientific practice aimed at changing one's sexual orientation, from being used on minors.

[61] Mills has taken steps to improve relations with Maine's native tribes, despite her prior rocky relationship with them as attorney general.