Duane "Dewey" Tomko (born December 31, 1946) is an American former kindergarten teacher turned professional poker player, based in Winter Haven, Florida.

Tomko was the runner-up in the World Series of Poker (WSOP) $10,000 no limit Texas hold'em Main Event in 1982 (to Jack Straus) and 2001 (to Carlos Mortensen). Besides his success in the Main Event, Tomko has won three WSOP bracelets, all in different variations of poker, in addition to various other tournament wins throughout his career.

Tomko was born and raised in Glassport, Pennsylvania, a suburb of Pittsburgh. He began playing poker profitably as a 16-year-old in Pittsburgh pool halls, which allowed him to finance his education.

Tomko worked as a kindergarten teacher for several years, and often played poker through the night. After Tomko realised that playing poker was more profitable than his job, he left his full-time job, played poker full-time and invested a sum of his winnings into businesses.

Tomko won his first career WSOP bracelet in 1979, in the $1,000 No Limit Hold'em event. He defeated Duanne Hammrich heads-up to win the title and $48,000 cash prize.

At the 1984 WSOP, Dewey won two bracelets. First, he won the $10,000 Deuce-to-Seven Draw event for $105,000. The next day, he went back-to-back, winning the $5,000 Pot Limit Omaha with re-buys event for his third bracelet and $135,000.

In addition to his WSOP success, Tomko has made two World Poker Tour (WPT) final tables. He finished runner-up in the 2003 Five Diamond World Poker Classic for $552,853 and in fourth place in the Costa Rica Classic for $14,650.

As of 2008, Tomko had played every WSOP Main Event since 1974, the longest streak at the time.