She replaces Elaine Cook, who has been on the board since 2014 and will retire next month.
Chairman Jason Te Brake said securing a person with Ms Angus' skill set would be "extremely beneficial" to the organisation.
It is a time of change at New Zealand Young Farmers with incumbent chief executive Terry Copeland recently appointed to the top job at Federated Farmers. Mr Copeland (50), who has been chief executive of New Zealand Young Farmers since 2013, replaces Graham Smith.
Federated Farmers president Katie Milne described Mr Copeland as a strategic thinker who understood young people.
"Terry's done an amazing job lifting the profile of New Zealand Young Farmers, building its membership base and increasing member participation. We need to get more young farmers engaged in the important work our organisation does. We're confident Terry can help us," she said.
During his time at New Zealand Young Farmers, Mr Copeland spearheaded projects to increase the number of people entering primary industry.
Before joining Young Farmers, he had more than 20 years' experience in the wine industry. He will finish in mid-July after the 50th anniversary FMG Young Farmer of the Year grand final in Invercargill.