Mia C. Costello (born January 11, 1968)[1] is a Republican politician from Alaska.

In November 2010, Costello defeated Democratic incumbent Bob Buch to win her House seat.

She ran for the Senate seat vacated by Democrat Hollis French in 2014, picking up the seat to add to the Republican Senate Majority.

[3] Prior to being elected to the Alaska State House, Costello worked as a school teacher, legislative aide, and as deputy communications director for Governor Frank Murkowski.

[4] After graduating from West High School, she earned her B.A.