Corsie captained the Scotland U-19 team to the finals of the 2008 UEFA Women's Under-19 Championship. At the 2009 Cyprus Cup, Corsie made her senior debut against France and was selected in all Scotland's games at the tournament.
As of January 2015, Corsie has earned over 70 caps for the senior national team and has scored 13 goals playing primarily in the central defender position. She scored three goals during the 2011 FIFA Women's World Cup qualification. In March 2011, Corsie captained the team to a 2–0 win over England at the 2011 Cyprus Cup, a first for Scotland in more than 30 years.
Corsie scored four goals for Scotland during UEFA qualifying for the 2015 FIFA Women's World Cup. Scotland finished second in their qualifying group and advanced to the UEFA play-offs where they were eliminated by the Netherlands.
In 2017 Scotland qualified for the European Championships for the first time ever. Corsie was named to the Scotland Team for Euro 2017 and appeared in all three group games for Scotland. On September 10, 2017, Corsie was named the new captain of the Scotland Women's National Team following the retirement of Gemma Fay.
Corsie made her 100th international appearance on 12 June 2018, in a 2019 World Cup qualifier against Poland. Scotland won their qualifying group and qualified for the World Cup for the first time ever.
Corsie made her World Cup debut at the 2019 World Cup. She played every minute of Scotland's three group games. Scotland suffered two consecutive 2–1 losses to start the World Cup. In their third group match against Argentina, Scotland was leading 3–0 in the 70th minute before giving up three unanswered goals. The game would finish in a 3–3 draw eliminating Scotland's chances of advancing to the knockout round.
