Megaprojects are now as important as ever. As a response to the pandemic, the European Union has put forward the Next Generation EU policy, making available a 2021–2027 long-term budget of €1.8 trillion to fund projects with ecological and digital applications in the field of telecommunication, transportation, and energy infrastructures. Similarly, in the United States a $1.9 trillion Covid relief plan is on the way. Also, China has planned to expedite the rollout of 102 infrastructure megaprojects earmarked for the 2021–25 development plan. Despite their importance to policy-makers, megaprojects are often met with criticism and opposition by citizens, and often go off the rails—either with regard to budget or time, or both. This introductory article presents the aim and scope of the themed issue. It positions the problem areas beyond technical issues and connects them to the social and institutional environment within which megaprojects are planned and implemented. Moreover, the article makes the case for conceptualizing megaprojects as wicked policy fields. In doing so, we specify the three defining elements of megaprojects, namely, complexity, uncertainty, and conflict. The article argues that megaproject development cannot be seen as a rational, straightforward process. It is often a non-linear, conflictual process shaped by the collective action of different stakeholder groups (e.g., project managers, policy-makers, and citizens). Driven by divergent interests, sociotechnical imaginaries, as well as behavioral and discursive logics, groups of actors construct and mobilize narratives to influence final decision-making while interacting with the institutional context.