Tammy Miller (born February 8, 1960) is an American politician and corporate executive from North Dakota.

Growing up, Tammy worked in her family's lumber and hardware store, Miller's Shopping Center on the Prairie, cleaning toilets and stocking shelves.

Under Miller's leadership, Border States grew from under $500 million in annual sales to nearly $2.5 billion and became the sixth-largest electrical distributor in North America.

Brent Sanford announced his resignation as lieutenant governor of North Dakota, effective January 2, 2023.

Because Burgum was running for president during most of 2023, Miller was responsible for more state government operations than previous lieutenant governors.

[9] Miller ceremonially pardoned the turkey for the 2023 Thanksgiving day,[10] along with visiting the Grand Forks Air Force Base in October.

The ad featured Burgum praising Miller's successes as lieutenant governor and comparing her business experience and outsider status to President Donald Trump's.

[21] On April 23, Miller faced Armstrong in a debate hosted by Prairie Public Broadcasting, in which she called him a career politician in rebuttal to his claim that she did not have the relationships to efficiently lead.

[22] On May 15, Miller received criticism and negative reporting after releasing an attack ad discussing how Armstrong, as an attorney, defended a child rapist in 2007.

[31] Miller has said that the Biden administration's “burdensome regulations” are hurting North Dakota's oil, energy, agriculture industries.