A straight flush is a poker hand such as Q♠ J♠ 10♠ 9♠ 8♠, which contains five cards in sequence, all of the same suit. It ranks above all other poker hands (unless wild cards are used, in which case it ranks below five of a kind).

Two such hands are compared by their high card in the same way as are straights, and the same wild card rules apply as for straights. The ace rule also applies: 5♦ 4♦ 3♦ 2♦ A♦ is a 5-high straight flush (sometimes called a "steel wheel"). An ace-high straight flush such as A♣ K♣ Q♣ J♣ 10♣ is called a royal flush, and is the highest ranking poker hand possible without wild cards.

Examples:

• 7♥ 6♥ 5♥ 4♥ 3♥ beats 5♠ 4♠ 3♠ 2♠ A♠
• J♣ 10♣ 9♣ 8♣ 7♣ ties J♦ 10♦ 9♦ 8♦ 7♦