Glenfiddich distillery (Scottish English: ) is a Speyside single malt Scotch whisky distillery owned by William Grant & Sons in the Scottish burgh of Dufftown in Moray. The name Glenfiddich derives from the Scottish Gaelic Gleann Fhiodhaich meaning "valley of the deer", which is reflected in Glenfiddich's stag logo.
 The Glenfiddich Distillery was founded in 1886 by William Grant in Dufftown, Scotland, in the glen of the River Fiddich. The Glenfiddich single malt whisky first ran from the stills on Christmas Day, 1887.
 In the 1920s, with prohibition in force in the US, Glenfiddich was one of a very small number of distilleries to increase production. This put them in a strong position to meet the sudden rise in demand for fine aged whiskies that came with the repeal of prohibition.
 In the 1950s, the Grant family built up an onsite infrastructure that included coppersmiths to maintain the copper stills, and a dedicated cooperage that is now one of the very few remaining in distilleries. In 1956 the Grant's brand launched the now-iconic triangular bottle, designed by Hans Schleger.
 
Following difficult times in the 1960s and 1970s, many small, independent distillers were bought up or went out of business. In order to survive, W. Grant & Sons expanded their production of the drink, and introduced advertising campaigns and a visitors' centre. In this period they also took the decision to begin marketing single malt as a premium brand in its own right, effectively creating the modern single malt whisky category with the 1963 introduction of Glenfiddich single malt to the United States and other foreign markets. Later, W. Grant & Sons was one of the first distilleries to package its bottles in tubes and gift tins, as well as recognising the importance of the duty-free market for spirits. This marketing strategy was successful, and Glenfiddich has since become the world's best-selling single malt. It is sold in 180 countries, and accounts for about 35% of single malt sales.
 Glenfiddich is currently managed by the fifth generation of William Grant's descendants.
 In September 2014, William Grant & Sons agreed to acquire Drambuie for an undisclosed price rumoured to be in the region of £100 million.
 In 2015, Glenfiddich commissioned ad agency Gravity Thinking to create a high tech YouTube campaign titled The Finishing Touch to promote the relaunch of their 21yo single malt, aged in Caribbean Reserva Rum Casks. The video showed a levitron isolating a single drop of whisky in a mid-air suspended animation, and featured Puerto Rican singer Calma Carmona performing the Franz Ferdinand song Love Illumination with the orchestra of the Scottish Opera arranged and conducted by Derek Williams. By the end of the campaign, the video had garnered more than 1.7 million YouTube hits.
 Since 2002, Glenfiddich has had an Artists in Residence (AiR) programme with a total budget of £130,000 allowing artists to stay and work in the distillery each year. In 2019 there were eight artists in residence and in 2021, there were six artists in residence.
 In 2021, the distillery began converting distillery trucks to run on Biogas made from the distillery waste products.
 The Glenfiddich distillery produce the Glenfiddich whisky in Dufftown, Moray.
 Glenfiddich is a single malt Scotch whisky, this means the whisky was distilled at a single distillery using a pot still distillation process and must be made from a mash of malted barley.
 Onsite there are 43 distinctively-shaped "swan neck" copper pot stills. These stills are smaller than those now in use at most other major distilleries. All stills are handmade and Glenfiddich employs a team of craftsmen and coppersmiths to maintain them. These stills have a capacity of around 21,000,000 litres of spirit.
 The water source for Glenfiddich Whisky is The Robbie Dhu springs nearby to the distillery.
 Glenfiddich is matured in many different casks, such as:
 Once the spirit has matured, the casks are emptied and the whisky is "cut" with pure Robbie Dhu spring water.
 Glenfiddich has a bottling hall onsite along with a large bottling plant in Bellshill.
 Glenfiddich is a distillery in Scotland's Malt Whisky Trail, a tourism initiative featuring seven working Speyside distilleries including Glenfiddich, a historic distillery (Dallas Dhu, now a museum) and the Speyside Cooperage.
 Glenfiddich's whiskies have performed well at international spirits ratings competitions.  The 12, 15, 18, and 21-year offerings have all rated well in the San Francisco World Spirits Competition and the Beverage Testing Institutes' reviews. On balance, the 15-year whisky has performed the best, receiving three double-gold medals (in four years) at the 2007–2010 San Francisco competitions and a score of 91 with the Beverage Testing Institute.
 Started in 1970, Glenfiddich promoted the Glenfiddich Food and Drink Awards to honour distinguished writing and broadcasting in the fields of food and drink in the UK. In 2008, Glenfiddich decided to discontinue distributing Food and Drink Awards, reviewing their "strategy, scope and potential application in some of Glenfiddich’s key markets outside the UK."
 Started in 1998, Glenfiddich promoted the Glenfiddich Spirit of Scotland Awards. The Glenfiddich Spirit of Scotland Awards were annual awards given to notable Scottish people. Glenfiddich sponsored the event, in association with The Scotsman newspaper. Nine awards were distributed for art, business, environment, food, music, screen, sport, writing and "Top Scot". A consulting panel nominated four people in each category, with the winner decided by a public vote. The "Top Scot" is an open award, with the public able to nominate anyone. The awards haven't been hosted since 2014.