Antiques dealer, someone who sells Antiques
Broker-dealer, a legal term for a business firm that buys and sells securities before selling the securities to customers
Croupier or poker dealer, the player who deals cards, or the employee of a gaming establishment who deals the cards
Dealer (franchising), a person who sells on behalf of a company or organization, particularly in the automobile industry
Car dealership
Drug dealer, someone who sells illegal drugs
Dealer (band), an Austrian hard rock band
An alternative usage of the term trader, being generally someone who trades
"Dealer", a song by Deep Purple from their 1975 album Come Taste the Band
Dealers (film), a 1989 British film