Lynne Cosgrove (née Payne) was born and raised in Sydney’s southern suburbs. After attending Penshurst Girls High School, she studied art, then worked as a layout artist and copywriter in the retail fashion industry before spending several years in the finance sector. She travelled widely overseas during this period.

She met Peter Cosgrove in early 1975 and they married in 1976. They have three adult sons and two grandchildren.

During Sir Peter’s long military career, she accompanied him on postings throughout Australia and in several overseas countries including the United States of America, the United Kingdom and India.

Lady Cosgrove has been actively involved in the welfare of partners in the defence community and became the inaugural Patron of Partners of Veterans Australia. She has worked with numerous voluntary organisations supporting aged and disabled people, and endangered Australian wildlife.

Her personal interests include art and architecture, nature and gardens, and she is a keen sports follower. Lady Cosgrove became an Ambassador for Kookaburra Kids in 2016, and has not only attended and represented the foundation at various events, but has provided opportunities for the children to visit Admiralty House.