1. Biological Invasions: A Global Threat to Insect Diversity Section 1: Biodiversity, Insect Decline, and Consequences of Global Trade 2. Biodiversity and the Importance of Insect Diversity 3. The Insect Decline Syndrome 4. Global Trade in Alien Species: A Challenge for Insect Conservation Section 2: Impacts of Invasive Alien Species on Insect Diversity 5. Alien Plants and Insect Diversity 6. Invasive Alien Insects and Insect Decline 7. Invasive Alien Non-insect Invertebrates and Insect Diversity 8. The Impact of Invasive Alien Vertebrates on Native Insects 9. Microorganisms and Disease-Mediated Invasions Affecting Native Insect Conservation Section 3: Lessons from Management and Monitoring Programs: Restoration Ecology and Citizen Science as Socio-Ecological Solutions 10. Reconciling Invasive Alien Species Management and Insect Conservation in Terrestrial Ecosystems 11. The Role of Citizen Science in Biodiversity Monitoring: When Invasive Species and Insects Meet 12. From Trade Regulations to Socio-Ecological Solutions: Present and Future Actions to Promote Insect Conservation