A single malt released under the Tullamore DEW label, triple distilled in the Irish tradition and then finished in a range of different casks: bourbon, oloroso sherry, port and madeira.

Now produced by William Grant & Sons Tullamore Dew, rendered in most branding as Tullamore D.E.W. (typically with the dots de-emphasised using colour and font size), is the second-largest-selling brand of Irish whiskey globally.

The whiskey was originally produced in Tullamore, County Offaly, Ireland, at the old Tullamore Distillery which was established in 1829. Its name is derived from the initials of Daniel E. Williams (D.E.W.), a general manager and later owner of the original distillery. In 1954, the original distillery closed down, and with stocks of whiskey running low, the brand was sold to John Powers & Son, another Irish distiller in the 1960s, with production transferred to the Midleton Distillery, County Cork in the 1970s following a merger of three major Irish distillers.

In 2010, the brand was purchased by William Grant & Sons, who constructed a new distillery on the outskirts of Tullamore. The new distillery opened in 2014, bringing production of the whiskey back to the town after a break of sixty years.