Tailors' Hall is the oldest of two surviving guildhalls in Dublin, Ireland. It is located on Back Lane, off High Street, in the part of the city known as the Liberties. Aside from meetings of its own and many other of the guilds of Dublin, the hall has hosted many social, cultural and educational events. It has been used as a court-house, a barracks, a school, a place of worship and in place of Dublin's City Hall. It was also a meeting place of the United Irishmen, and the site of the Back Lane Parliament. The Tailors' Guild having fully released it by 1873, the building hosted a Christian Mission and later the Legion of Mary. The building having become uninhabitable by the mid-20th century, the Irish Georgian Society launched a restoration campaign in 1966, and it was reopened in 1971. It now holds the headquarters of Ireland's national heritage charity, An Taisce, and can be visited, and rented for events.

The building is on Back Lane, off High Street, near Christ Church Cathedral, which overlooks the River Liffey. The hall lies within the Liberties, and the postal district of Dublin 8.

The Corporation of Tailors, Tailors' Guild or Guild of Merchant Tailors historically claimed to be the oldest guild in Dublin, chartered in 1207 by King John, Lord of Ireland, although the oldest charter physically traced dates to 1418, as granted by King Henry V. A second charter, of 1419, elaborated the powers of what was formally the Fraternity of St John the Baptist; these powers included a right to search out clothes being made for sale by anyone not a member of the guild. The Tailors' Hall of Dublin, then located in Winetavern Street, is first mentioned in records in 1539; it was succeeded by a new hall on land belonging to the guild on one side of Back Lane, built in 1583 and 1584.

The foundation of the current building, across Back Lane from the previous hall, was laid in 1703. The site had previously held a Jesuit chapel and college, later annexed to Trinity College Dublin and then again a Mass-house; remnants of this earlier building may be embedded in the current building. The hall was built by contractors Wolfinton and Taylor, with their overseer (a Mr Mills) and team of craftsmen. It was completed in 1707. It was described as having, on one side of the entrance, a principal room of 45 by 21 feet (13.7 by 6.4 m), with a gallery, a throne for the Guild Master, and paintings of Dean Swift, a St Homohon and two past kings. On the other side of the entrance was a smaller meeting room, and there was a stairs from basement to attics.

The main Georgian doorcase to the building off back lane was added around 1770-71 along with a bust of George III.

Aside from their own meetings, the guild commissioned the hall to be suitable for leasing, and included living quarters (a kitchen, parlour and garrets) also for rental. Rental uses included meetings of other Dublin guilds (including those of the shoemakers, hosiers, glovers, shearmen, smiths, joiners, brewers, and apothecaries and barber-surgeons), and the Freemasons, along with Methodist and Baptist gatherings, and classes such as dancing and fencing, as well as balls, theatrical performances, concerts and drawings of lotteries. In 1785, lettings for dancing, fencing and drama were discontinued, due to damage they caused. In 1771, the main hall was also dedicated for services of the Church of Ireland.

Tailors' Hall also hosted some meetings of the city council (the Board of Aldermen and Common Council of Dublin Corporation), including one at which a mayor, Henry Gore Sankey, and sheriffs including James Napper Tandy, were elected, and a vote of thanks to Lord Henry Fitzgerald and Henry Grattan were passed. It was also a meeting place for the United Irishmen in Dublin, and the site of the Back Lane Parliament, which developed a petition on behalf of Irish Catholics which was successfully presented to the King in London; one result of the petition was the opening of the Dublin Guilds to Catholic membership, starting with the Dublin Tailors.

In 1798 the hall was taken over temporarily by the British Army as they accommodated extra troops to suppress the 1798 Rebellion. In 1799 the Tailors, meeting at the hall, opposed the proposed Acts of Union of 1800, and a decade later passed a motion regretting the Union and the damage it had done to Dublin and business. The hall also functioned as the court house of the Court of Insolvent Debtors for around three years around 1820.