The 2018 season was the Seattle Seahawks' 43rd in the National Football League (NFL) and their ninth under head coach Pete Carroll.

With a win over the Kansas City Chiefs and eventual league MVP Patrick Mahomes in Week 16, the Seahawks returned to the playoffs; their seventh appearance in the nine seasons under Carroll.

However, the Seahawks suffered their first one-and-done postseason campaign since 2004, as they fell to the Dallas Cowboys in the Wild Card round 24–22.

This was the first season since 2011 that the team did not feature the original Legion of Boom defensive unit and did not have Richard Sherman on the roster, as he was released on March 9 and signed with division rival San Francisco 49ers.

Tight ends Jimmy Graham and Luke Willson, wide receiver Paul Richardson, and running back Thomas Rawls all departed in free agency as well.

With his release, the Seahawks shifted the punting duties to their fifth-round rookie Michael Dickson, who went on to make the Pro Bowl and was named First-team All-Pro.

In tribute, the team wore patches labeled "PGA" (Allen’s initials) for the rest of the season beginning at the game against the Detroit Lions.

Running backs (RB) Wide receivers (WR) Tight ends (TE) Defensive linemen (DL) Defensive backs (DB) Special teams Reserve On January 11, 2018, the NFL announced that the Seahawks will play the Oakland Raiders in a London Game in London, England, with the Raiders serving as the home team.

This was the first time since 2013 that the Seahawks have lost to the 49ers, snapping a ten-game winning streak against the 49ers which dates back to 2013 NFC Championship game.