Dame Diane Elizabeth Robertson DNZM (née Coburn; born 11 May 1953) is a New Zealand community leader.

She was the Auckland City Missioner from 1998 until 2015, and was the first woman to serve in the role.

[1] She met her husband, Wilfred Holt, when she was teaching at Waiouru Military Camp and he was serving in the army,[2] and they married in 1975.

[1] In 1998, Robertson was appointed the Auckland City Missioner, having previously been a teacher, counsellor and involved in youth work and a manager of a social services agency.

[1] In the 2015 Queen's Birthday Honours, she was appointed a Dame Companion of the New Zealand Order of Merit, for services to the community.