When the Seahawks debuted in 1976, the team's logo was a stylized royal blue and forest green hawk's head based on Northwestern tribal art. The helmet and pants were silver while the home uniforms were royal blue with white, blue and green arm stripes. The road uniform was white with blue and green arm stripes.

In 1983, coinciding with the arrival of Chuck Knox as coach, the uniforms were updated slightly. The striping on the arms now incorporated the Seahawks logo, and the TV numbers moved onto the shoulders. Helmet facemasks changed from silver to blue.

In 2002, both the logo and the uniforms were heavily redesigned. The logo was designed by Mark Verlander. The colors were modified to a lighter "Seahawks Blue", a darker "Seahawks Navy" and neon green piping. The helmets also were changed from silver to the lighter "Seahawks Blue" color after a fan poll was conducted. At first, the team had planned to wear silver helmets at home and blue helmets on the road, but since NFL rules forbid the use of multiple helmets, the team held the fan poll to decide which color helmet would be worn. Due to the reflectivity of the paint used, the appearance of the helmets' color can vary widely between gray, navy, and turquoise, depending on the lighting. The team has usually worn all blue at home and all white on the road since 2003. The blue-on-white combo has been worn for only one regular season game, the 2005 season opener at the Jacksonville Jaguars, while the white-on-blue combination has not been worn regularly since late in the 2002 season and made its final appearance to date in a December 7, 2003 game against the Minnesota Vikings. The Seahawks also wore their home blues during Super Bowl XL despite the fact they were designated as the visitor. This was as a result of the Pittsburgh Steelers insisting on wearing their road uniforms because of their recent road success.

In 2005, there were rumors of a primarily neon green Seahawks jersey to be used as an alternate. However, this jersey never appeared.