Engaged digital humanities is often discussed in terms of participatory formats such as citizen science, crowdsourcing and co-creation projects. While these are vital, they capture only one dimension of engagement. This paper argues that engagement is also, and crucially, a matter of infrastructural design: of how institutions, resources, tools and expertise are organized to support sustained interaction between research, memory institutions and society.

Digital humanities infrastructures play a critical and under-examined role in shaping how research connects with society because they function as integrative systems. They determine how institutions work together, how cultural data is structured and accessed, and when and where questions of public use, responsibility, and inclusion are addressed. These decisions shape engagement long before any public-facing project begins.

The paper offers a situated reflection on what it means to build infrastructures of engagement in a small national context, drawing on the experience of the Icelandic Centre for Digital Humanities and Arts (MSHL/CDHA). MSHL brings together fifteen highly heterogeneous partner institutions, spanning universities, national and local museums, archives, libraries and media organizations. This breadth is unusual even by European digital humanities standards and has enabled collaboration across institutions with very different mandates.

Rather than focusing on individual projects, this paper examines MSHL itself as an engagement infrastructure: a coordinating layer that connects institutional ecosystems, stabilizes collaboration, and aligns research practices with public-facing cultural work. From this experience, we distill a set of transferable design principles for engaged digital humanities infrastructures.

First, engagement benefits from heterogeneous institutional design. Bringing together institutions with fundamentally different mandates (research, preservation, mediation, broadcasting, education) creates conditions for hybridity, where disciplinary, technical and cultural practices for public engagement are co-developed rather than aligned post hoc.

Second, engagement depends on shared infrastructure, not only shared goals. Pooling equipment, platforms and expertise lowers institutional boundaries and turns collaboration into routine practice. This is visible in the shared operation of high-resolution digitization equipment between Reykjavík City Museum, the National Museum and the University Hospital, where the same infrastructure supports very different collections and audiences. It is also evident in the VR equipment initially developed in a Nordplus project and subsequently made available more broadly through MSHL’s mediation, allowing students and partners to reuse tools beyond the original project context.

Third, sustained engagement requires dedicated coordinating entities. Durable centers and networks are necessary to mediate between institutional cultures, maintain infrastructures and carry relationships beyond individual funding cycles. This is evident in the ongoing development of a national name authority register linking people and places across institutions.

The Icelandic case is not presented as a model to replicate, but as a lens that makes infrastructural dynamics unusually visible due to the small scale of the institutional landscape. The paper contributes concrete design insights to current discussions on infrastructures of engagement; it argues that if digital humanities is to operate “with and for society”, engagement must be conceived not only as participation, but as a property of how research infrastructures themselves are built.