For more than two decades, Richard Gooding traveled the world in search of his favorite whiskeys. Next year, the more than 3,900 bottles he collected will be sold in two auctions, including rare offerings from storied distilleries such as Macallan, Bowmore and Stromness.

Whisky Auctioneer, an online auctioneer based in Scotland, announced the sale on Monday and expects the collection to fetch more than $10 million.

Mr. Gooding, a Colorado businessman, was a frequent traveler to Ireland and Scotland, where he attended auctions and purchased whiskeys directly from distilleries, according to a video about the collection.

As well as buying rare vintages, he bought one-of-a-kind whiskeys for tasting with friends.

Mr. Gooding, who died in 2014, was the scion of a distribution and bottling empire; his grandfather started the Pepsi Cola Bottling Company of Denver in 1936. The younger Gooding inherited the company from his father and took over as owner and chief executive from 1979 to 1988, according to his obituary.