The 2021 Constellation Cup, also known as the Cadbury Netball Series, was the 11th Constellation Cup series between New Zealand and Australia.

The series featured four netball test matches, played in March 2021.

Sources:[12][13][14] Jane Watson and Gina Crampton captained the Silver Ferns second match due to Ameliaranne Ekenasio being unwell.

Source:[14][20] Because of the COVID-19 pandemic, Australia and New Zealand umpires took charge of the series.

In 2020, the International Netball Federation introduced an interim policy to allow umpires to be appointed to games involving their own country, if it was too impractical to get umpires in from overseas.