"Wyeast" is a nickname for the Brewer's Choice line of liquid brewing yeasts from Logsdon's Wyeast Laboratories. There are more than a dozen varieties of ale and lager yeasts available from Wyeast. Many brewers that use Wyeast consider it to be of high quality, uncontaminated by bacteria. For a report on contaminants in liquid and dry yeasts available to homebrewers, see the "Yeast" special issue of Zymurgy. Good results can be obtained from either dry or liquid yeasts, especially for brewers that are willing to carefully home culture yeasts that they know to be pure and provide good results.

The name Wyeast is pronounced like "Why-yeast", not "double-u yeast", and is the name that the local Native Americans had given to Mt. Hood in Oregon, which stands near the site of the Wyeast lab.

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