The Seattle 12s are the incredibly loud, loyal fans of the NFL’s Seattle Seahawks, nicknamed as if they were the team’s “12th player” on the field.

Quick Scoop: What are the Seattle 12s?

  • “12s” is the official nickname for Seattle Seahawks fans, formerly called the “12th man.”
  • The idea comes from football having 11 players on the field; the fans are treated as an extra, influential player because of their noise and energy.
  • The Seahawks retired jersey number 12 in 1984 to honor the fanbase, permanently reserving it for the crowd.
  • At home games in Lumen Field, the 12s are known for creating deafening noise that can cause false starts, force timeouts, and rattle opposing offenses.
  • Seattle often flies a big 12 flag around the city and at the stadium, and raising that flag before games has become a ritual that symbolizes the presence of the 12s.

A bit of current/trending context

  • The 12s remain a key part of Seattle’s football identity, frequently highlighted in recent features and anniversary pieces about the fanbase and the 40+ years of the “12” tradition.
  • Media and fans still describe the 12s as one of the loudest and most passionate groups in the NFL, and they’re often brought up whenever home‑field advantage in Seattle is discussed.

In short, if you hear people talking about “Seattle 12s,” they’re talking about Seahawks fans, not a player or a formation.

TL;DR: The Seattle 12s are Seahawks fans, celebrated as the team’s extra “12th” player because their noise and passion heavily influence home games.

Information gathered from public forums or data available on the internet and portrayed here.