Prime Minister Jacinda was one of a number of high-profile guests, including US Vice President Kamala Harris, to address the European Union Parliament for International Women's Day.
"We need to stick together because we are all in this together," Ardern told MPs via video yesterday (NZ time).
She said Covid-19 had exacerbated structural inequalities between women and men.
"Only by fully – and meaningfully – including women in leadership at all levels can we ensure that our responses to the pandemic meet the needs of everyone."