The 9th Annual New Zealand Ocean Acidification workshop will be held on Friday 8th July at Victoria University Wellington, following the AMSA/NZMSS conference. Scientists, policy makers and stakeholders are all welcome. The workshop this year includes a plenary speaker, short talks, updates from OA projects, and short discussion sessions on OA research coordination, directions and value to management, mitigation and adaptation. Please submit abstracts for talks and posters by the 16th May (template available from Helen.Bostock@niwa.co.nz). We also encourage people to present talks at the OA session at the NZMSS on the 7th July.