The rationale of this article is the need to elicit the trending themes relevant to the latest research on biodiversity conservation and tourism sustainability. Hence, the purpose of this study: stocktaking of cutting-edge research articles in this field and elicit the critical trends and issues shaping the knowledge, future research, and technical development perspectives on biodiversity conservation and tourism sustainability. The focus is on the trends, which are pivotal for achieving the UN Sustainable Development Goals until 2030. A hierarchical cluster analysis was undertaken with a KH Coder 3.0 tool to elicit topical co-occurrence networks for thematic words in academic papers from 2015 to 2020 on the topic, quarried from Google Scholar. The article’s main findings are the seven identified major trending research themes on biodiversity conservation and tourism sustainability: (1) Community-based tourism development; (2) National Park management for tourism; (3) Sustainable tourist motivation; (4) Biodiversity conservation and ecotourism; (5) Landscape and land-use changes; (6) Visitor satisfaction monitoring; and (7) Ecotourism modeling. The article’s main conclusion is that the criteria and conditions for responsible low-key tourism in protected areas, both for biodiversity and local communities, are pivotal factors to consider for future research on biodiversity conservation and tourism sustainability.