Katarzyna Portasià Âska (née Janiszewska born 26 October 1995) is a Polish handball player for Danish club Viborg HK and the Polish national team.
Portasià Âska played for GTPR Gdynia until 2018. Here she won the Polish championship in 2017 and the Polish cup in 2014, 2015 and 2016. In 2018 she joined German team SV Union Halle-Neustadt, which had just been promoted to the Bundesliga. She played there for a season, where she was relegated to the 2. Bundesliga. She then joined TuS Metzingen in the Bundesliga. A year later she joined French side Paris 92. After a season in France she returned to Poland, where she joined MKS Lublin. In 2023 she joined Danish side Viborg HK.