The Irish National Teachers' Organisation (INTO), (Irish: Cumann Múinteoirí Éireann), which was founded in 1868, is the largest teachers' trade union in Ireland. It represents teachers at primary level in the Republic of Ireland, and at primary and post-primary level in Northern Ireland. The head office is at Parnell Square, Dublin, there is also an office in Belfast. The current INTO President (2016–17) is Rosena Jordan; Sheila Nunan is the General Secretary in the Republic and Gerry Murphy is the Northern Secretary.

As of 2015, the INTO claims to have 40,615 members – 33,690 in the 26 counties and 6,925 in the 6 counties.

INTO Learning is the professional development and union training department/section of the Irish National Teachers’ Organisation (INTO). It is dedicated to expanding the boundaries of teacher professional development and trade union training.

The key principles underpinning the work of INTO Learning are:

• Accessibility to programmes across the country
• Quality in the design and delivery guaranteed by monitoring and evaluation
• Accountability and cost effectiveness
• In drawing up our professional development and training programmes for members  INTO Learning seeks to meet the identified needs in a constantly changing educational landscape. To ensure that our programmes are relevant to those professional needs practising teachers are engaged in the design the structure, content and methodologies of the courses.

INTO Learning does not work in isolation and consistently draws upon the experience and expertise of professionals from the wider education and trade union community. INTO Learning also offers a variety of collaborative opportunities including online course hosting and administration and training and support in online course context and design.