Up for debate - likely blue
- In A Very Crappy Christmas, Butters shows the main four cutout versions of themselves. Kyle comments,
"Stan's got blue eyes and I've got a sharper nose, but I mean, they kinda look like us."Assuming Kyle was commenting about his real nose shape, we can therefore conclude that Stan's eyes are, in fact blue.
- In the 8th draft of the South Park Movie, he is described as such:
A little eight year old boy walks happily down the street. He is STAN MARSH, a noble looking boy with piercing blue eyes and a strong chin. As he walks, he sings a happy song.
- In Good Times with Weapons, Stan's ninja alter ego has black hair and brown eyes.However, Kyle's alter ego has black hair and brown eyes, while Kyle's canon hair color is red.