Johnston represented Ontario at the 2007 Canada Winter Games. In the gold medal match versus Manitoba, Johnston and White each had one goal and two assists, as Ontario won by a score of 6–3 and finished the tournament undefeated. In a game versus Newfoundland at the Canada Winter Games, Johnston was on a line with Mallory Deluce and Jenn Wakefield. The three combined for 12 points in a 19–0 victory.
Cornell University
Johnston was Cornell's first player to be named first-team ECAC Hockey and receive rookie of the year honors. She was also named first-team All-Ivy and Ivy League Rookie of the Year. In the 2008–09 season, Johnston's 37-point total were the most points in a season for Cornell since the 1991–92 campaign. Johnston's 37-point total in mid-February led the entire ECAC league in overall points. She was also second in the league and sixth in the NCAA in points per game with 1.85. She was selected for membership in the Quill and Dagger society.
Hockey Canada
Johnston won two gold medals with the National Women's Under-22 Team at the Air Canada Cup. Rebecca made her debut at the 2008 IIHF World Women's Championship, playing in all five games as Canada won silver. Rebecca Johnston was a member of Canada's Under-22 Team. The U-22 participated in the MLP Cup, held in Ravensburg, Germany from Jan. 2–6, 2009. Johnston was part of the silver medal winning team. In the tournament, Johnston accumulated seven points. Her best game was in an 11–0 victory over Russia. Johnston scored a hat trick and added an assist. In addition to the MLP Cup, Johnston played with the Canadian Senior Team in the Four Nations Cup between Nov. 4–9, 2009. Johnston was part of the silver medal winning team. In the gold medal game of the 2010 Four Nations Cup, Rebecca Johnston's second goal of the game clinched the gold medal for Canada. Said goal came on a power play 6:21 into overtime. The goal gave Canada a 3–2 win over the United States. It was Hockey Canada's 12th championship in the tournament's 15-year history. She would lead all Canadian scorers in the tournament with four goals. In a game versus Russia at the 2012 IIHF Women's World Championship, Johnston registered a five-point game in a 14–1 victory. In December 2013, Johnston was named to 2014 Olympic roster for Canada.
CWHL
In her first season with the Calgary Inferno, Johnston broke Danny Stone's franchise record for most points scored in one season. In addition, she clinched the Angela James Bowl, awarded to the league's scoring leader. Johnston helped the Calgary Inferno capture their first-ever Clarkson Cup championship in 2016. Contested at Ottawa's Canadian Tire Centre, she scored twice in an 8–3 victory over Les Canadiennes de Montreal.
Career statistics
Cornell University
Team Canada
CWHL
CWHL Playoffs
Awards and honours
NCAA
2008 ECAC Women's Hockey Preseason All-League team
First Team All-Ivy League, 2007–08, Forward
Ivy League Rookie of the Year 2007–08, Unanimous selection
