The Arizona Cardinals are a division rival of the Seattle Seahawks in the NFC West, and have played against them twice every year since 2002.
The Los Angeles Rams are another division rival of the Seattle Seahawks in the NFC West, and have played against them twice every year since 2002, except for the 2016 season when they were based in St. Louis.
The San Francisco 49ers are the third division rival of the Seattle Seahawks in the NFC West, and have played against them twice every year since 2002. They have also faced each other in the playoffs three times, most notably in the 2013 NFC Championship Game.
The New Orleans Saints are an NFC team that have played in the same division as the Seattle Seahawks in the past, when both teams were part of the NFC West from 1976 to 2001. They have also faced each other in the playoffs four times, most recently in the 2019 Wild Card Round.
The Atlanta Falcons are another NFC team that have played in the same division as the Seattle Seahawks in the past, when both teams were part of the NFC West from 1976 to 2001. They have also faced each other in the playoffs three times, most recently in the 2017 Divisional Round.