PurposeThe purpose of this paper is to address the critique of researchers, who question the effectiveness and sustainability of mentoring as a continuing professional development and learning (CPDL) process. Where a lack of awareness exists surrounding the potential benefits of mentoring for the mentor, this paper investigates whether engaging in and with mentoring through a mentoring community of practice (M-CoP) assists mentors to accrue and realise the benefits of engagement. A relationship will be drawn between the community of practice (CoP) dimensions as outlined by Wenger-Trayner and Wenger-Trayner (2015): domain, practice and community, and the perceived benefits accrued for mentors will be reported.Design/methodology/approachA qualitative approach was taken, using a participatory action learning action research strategy. In total, 12 mentors came together to form a developing M-CoP. They attended four M-CoP workshops where they grew as mentors, through the three dimensions of a CoP: domain, practice and community. Workshops were audio visually recorded and observed. Further data were gathered through an M-CoP questionnaire, pre-workshop questions, M-CoP artefacts, stimulus recall, reflective journals, reflective journey plans and extended focus group discussions. Respondent validation, inter-rater and intra-observer reliability were used. Data were coded manually and using NVivo-10 software.FindingsMany of the benefits reported were directly linked to participants’ engagement in and with the three M-CoP dimensions: domain, practice and community. Such benefits related to mentor identity, support and solidarity, engagement and interaction, sharing “for” and learning “from” other mentors, and knowledge expansion and boundary spanning. Participants reported that engaging in and with mentor education through an M-CoP was an effective CPDL process, which was beneficial for them as developing mentors.Research limitations/implicationsThe sample size was limited, based in one country and focussed upon one subject specialism. Such reported benefits need to be disseminated in order to raise the awareness of policy makers, teacher education institution managers and teacher educators, teachers and school leaders of the benefits of engaging in mentoring CPDL through the process of M-CoP engagement.Practical implicationsThe findings from this study can be used to inform policies related to the continuum of teacher education. A recommendation is made for policy makers, teacher education institution managers, school leaders and CPDL service providers to facilitate the development of M-CoPs and to support their growth. It is also suggested that government departments of education and professional standards bodies account for the resourcing of such work in the design and implementation phase of school placement developments.Originality/valueThis paper closes the following gaps in the literature: CPDL benefits of engaging in and with an M-CoP for the mentor, the relationship between CPDL benefits and CoP dimensions and the development of M-CoPs in the given socio-cultural, historical and economic context of Ireland’s teacher education system and those of similar contexts.