:Undeb Cenedlaethol Athrawon Cymru

{{Short description|Welsh trade union}}

{{DISPLAYTITLE:{{lang|cy|Undeb Cenedlaethol Athrawon Cymru|nocat=y}}}}

{{Redirect|UCAC|the star catalogue|USNO CCD Astrograph Catalog|the university in Cameroon (Université Catholique de l'Afrique Centrale)|Catholic University of Central Africa}}

{{Use dmy dates|date=April 2022}}

{{Infobox union

| name = UCAC

| location_country = Wales

| affiliation = TUC

| members = {{increase}} 3,638 (2022){{cite web |url=https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1173721/533T_2022.pdf |title=Form AR21 - Trade Union and Labour Relations (Consolidation) Act 1992 Annual Return for a Trade Union |website=Gov.uk |year=2023 }}

| full_name = Undeb Cenedlaethol Athrawon Cymru

| native_name =

| image = Image:UCAC logo.png

| founded = 1940

| dissolved =

| merged =

| headquarters = Aberystwyth, Ceredigion

| key_people = Ceri Dafydd Evans, national president
Ioan Rhys Jones, general secretary

| website = {{Official URL}}

| footnotes =

}}

{{lang|cy|Undeb Cenedlaethol Athrawon Cymru}} (UCAC; National Union of Teachers of Wales) is a trade union for teachers and lecturers in Wales. It was formed in December 1940, when a number of teachers in Wales felt that the teaching unions which they belonged to, did not give due respect to the Welsh language. The union performs all the functions of a teaching union - negotiating the salary of members, campaigning for better working conditions, supporting members. Its administration is conducted through the medium of the Welsh language. Throughout its history, UCAC has campaigned for Welsh-medium education and an independent education system for Wales.

The union’s main objectives at its inception in 1940 were to ensure a better education system for Wales and to protect the interests of the individual teacher

It is affiliated to the UK Trades Union Congress (since 1994), since under current TUC rules it is not permissible to affiliate only to TUC Cymru.

Its main office is in Aberystwyth, Ceredigion.

Its archives are in Cardiff University Library’s Special Collections and Archives.