The Lagunitas Brewing Company is an American brewer, operating a microbrewery in Petaluma, California. They are known for iconoclastic interpretations of traditional beer styles, and irreverent descriptive text and stories on their packaging. Lagunitas Brewing's flagship, IPA, is consistently the best-selling IPA in the state of California according to IRI, the widely cited consumer product reporting company. The brewery was founded in 1993 by Tony Magee in Lagunitas, California and moved to nearby Petaluma when they quickly outgrew their original rural West Marin location.

Over the years from 1993 through 2007, Lagunitas has been among the fastest growing craft breweries in the U.S. producing nearly 52,000 barrels in 2007.[citation needed]

In 2005 the Sonoma County Brewery's license was suspended for 20 days when the California Department of Alcoholic Beverage Control witnessed marijuana consumption at one of the Brewery's parties. This suspension followed an eight-week undercover operation by the department when ABC officers attended Brewery open house events offered by the Brewery to attendees. The brewery chose to commemorate this event by producing a special release of a now-popular strong ale called "The Undercover Investigation Shut-Down Ale". Its label includes a libertarian polemic satirizing the authorities for overzealous and selective enforcement.

In 2006, Lagunitas began releasing a series of limited edition beers marking the 40th anniversary of each album by Frank Zappa. As of December, 2008, five beers have been released in the series, commemorating Zappa's albums from Freak Out! to Cruising with Ruben & the Jets.

[Submitted by Bob Fernandez]