Galloway, 23, had plied her trade for Barclays Women's Championship side Durham Women for the last three years, demonstrating her prowess in front of goal.
The Gateshead-born forward is a childhood Newcastle fan but came through the ranks at North East rivals Sunderland Ladies, making her first-team debut in 2016.
After four years in the Black Cats' senior set-up, Galloway made the decision to move to Durham Women in 2020.
Galloway regularly featured in the Championship during her time with the Wildcats and has also represented her country at youth level.
The striker received her first call-up to England under-19s in 2018 and scored twice during her time in the young Lionesses' set-up.
Delighted to add Galloway to her ranks, Newcastle Women manager Becky Langley said: "I worked with Bridget at Northumbria University and she was the top goalscorer in the league.
"She's a top girl and she's a very clever number nine. Her finishing is one of her strongest qualities. I am very excited to link back up with Bridget."
See Bridget Galloway in action when Newcastle United Women play West Bromwich Albion Women at St. James' Park on Saturday, 5th August as part of the two-day Sela Cup, presented by VisitMalta. Buy tickets here.