Metazoan parasites are among the most diverse, threatened, and under-protected animals on Earth, making it increasingly important to ask how and when we should prevent parasite extinctions. However, parasite conservation remains mostly based in theory, without clear goals and priorities, and with few practical guidelines. In this document, a working group of parasitologists and ecologists propose a formal action plan for conserving parasites that do not threaten human health or domesticated species, which the conservation community can leverage over the upcoming decade (2020 to 2030) to minimize the loss of parasite biodiversity. The twelve proposed goals highlight some of the biggest challenges and opportunities for parasite conservation, in four major domains: data collection and synthesis, risk assessment and prioritization, conservation practice, and outreach and education. Achieving these goals will improve future persistence of the ecologically important parasite fauna found across the globe.