Having spent years playing in the youth teams of Australia, Catley made her international senior debut against New Zealand in June 2012, the same match as her childhood friend Ashley Brown.
 Catley made 32 appearances for the Matildas leading into her first World Cup campaign.
 She was named to her second world cup, the 2019 FIFA Women's World Cup in France as a vice-captain on 14 May 2019
Catley was part of the Australia women's national soccer team squad for the 2015 FIFA Women's World Cup, and was a starter in the games against the United States, Nigeria, Sweden and Brazil.
 During the 2015 FIFA Women's World Cup Catley made all 5 starts at left back for Australia and played all 450 minutes.
She made 8 tackles and won them all.
Catley also made 12 interceptions and won 13 duels.
Steph had a 72.4 percent accuracy for passing.

Catley went onto play for the Matildas during the 2016 Rio Summer Olympics.
 She appeared in all 4 games for the Matildas making three starts.
 In 2017 Catley appeared in the 2017 Algarve Cup and 2017 Tournament of Nations.
 In 2018, Catley helped the Matildas in their fourth place win at the 2018 Algarve Cup, their second place win at the 2018 AFC Women's Asian Cup and 2019 Algarve Cup and their first place win at the 2017 Tournament of Nations.

On 14 May 2019 Catley was named to the squad as vice-captain for the 2019 FIFA Women's World Cup.
Having spent years playing in the youth teams of Australia, Catley made her international senior debut against New Zealand in June 2012, the same match as her childhood friend Ashley Brown.  Catley made 32 appearances for the Matildas leading into her first World Cup campaign.  She was named to her second world cup, the 2019 FIFA Women's World Cup in France as a vice-captain on 14 May 2019
Catley was part of the Australia women's national soccer team squad for the 2015 FIFA Women's World Cup, and was a starter in the games against the United States, Nigeria, Sweden and Brazil.  During the 2015 FIFA Women's World Cup Catley made all 5 starts at left back for Australia and played all 450 minutes. She made 8 tackles and won them all. Catley also made 12 interceptions and won 13 duels. Steph had a 72.4 percent accuracy for passing.
Catley went onto play for the Matildas during the 2016 Rio Summer Olympics.  She appeared in all 4 games for the Matildas making three starts.  In 2017 Catley appeared in the 2017 Algarve Cup and 2017 Tournament of Nations.  In 2018, Catley helped the Matildas in their fourth place win at the 2018 Algarve Cup, their second place win at the 2018 AFC Women's Asian Cup and 2019 Algarve Cup and their first place win at the 2017 Tournament of Nations.
On 14 May 2019 Catley was named to the squad as vice-captain for the 2019 FIFA Women's World Cup.
Steph Catley