[3] Miyares earned a Bachelor of Business Administration from James Madison University, and a Juris Doctor from the College of William & Mary’s Law School.

Unopposed in the June 2015 Republican primary, he defeated Democrat Bill Fleming in the November 2015 general election.

[4] Miyares also served on the Virginia Board of Veterans Services and as Chairman of the Commission on Equal Opportunity for Virginians in Aspiring and Diverse Communities.

[21] In September 2020, Miyares voted against legislation to authorize local governments to remove Confederate monuments on public property.

[16] He opposed proposals for the elimination of qualified immunity and declined to take a position on what he would do in the controversial police killing of Bijan Ghaisar.

[28] On May 10, 2023, Miyares defended his decision to not join with 22 other Republican state attorneys general when they filed a lawsuit seeking to ban the abortion medication mifepristone, saying he supported the Food and Drug Administration's regulations.

"[29] In January 2022, Miyares issued an advisory opinion in which he concluded that Virginia's public colleges and universities lacked the power to require students to receive the COVID-19 vaccine before enrolling or taking in-person classes.

Miyares himself has affirmed that Joe Biden was legitimately elected president and has condemned the attack on the United States Capitol.

[32][33] On October 10, 2023, Miyares sent a cease-and-desist letter to a right-wing advocacy group over their misinformation pertaining to the 2023 Virginia elections.

"[40] On September 7, 2023, Miyares reached a settlement with the Town of Windsor, in Isle of Wight County, over its alleged "discriminatory, unconstitutional policing" conduct.

"[41] The town police department will also have to "obtain accreditation from the Virginia Law Enforcement Professional Standards Commission, raising the bar on its internal investigation processes and officer training.

"[41] Jonathan Arthur, the attorney for Caron Nazario, a Black United States Army lieutenant, whose interaction with the Windsor police department prompted the investigation into its alleged discriminatory behavior, praised the settlement in an interview with WVEC.

[43] A report commissioned by Miyares found that $1.3 billion of retail goods were being stolen annually in Virginia, resulting in $80 million less in state sales tax revenue per annum.

[44][45][46][47] After the firings, Miyares hired former Commonwealth's Attorney for Arlington County and Falls Church City Theo Stamos, a moderate Democrat, to lead the conviction integrity unit.

[48][49] In June 2024, Miyares announced a $1.3 million settlement, including a $600,000 fine, from the Washington Commanders over their prior "unlawful retain[ment] of security deposits" for season ticket holders.

[6] Miyares is a member of the Galilee Episcopal Church and a past President of the Cape Henry Rotary, where he was a Paul Harris Fellow.