Dame Diana Buchanan Crossan DNZM (born 1949)[1] is a New Zealand public servant.

She worked at the State Services Commission, where she was the first manager of the Equal Employment Opportunities Unit.

[2] In the 2019 New Year Honours, Crossan was appointed a Dame Companion of the New Zealand Order of Merit, for services to the State.

[3] Crossan grew up in small towns in the South Island of New Zealand where her father was a teacher and Headmaster.

She attended high school in Pleasant Point New Zealand and in Roxboro, North Carolina, USA.