Motherhood and mothering are fundamental aspects of life, and as a consequence, every culture has knowledge, values, practices and expectations related to the role. Technologies now have an increasing role in motherhood, altering many women's experiences of pregnancy, birth, and mothering. For HCI, such a transition opens a whole host of questions relating to areas of participatory design, social connection, data sharing, identity, memory-making, emotion work, as well as offering a new lens through which to understand notions of care and wellbeing. This workshop will bring together researchers, designers, and practitioners interested in the role of motherhood, the act of mothering, and its relation to HCI and technology. We will identify a collective research agenda related to motherhood and HCI and forge connections amongst a community of researchers to support the sharing of knowledge, resources and design approaches.