The male Eurasian Wigeon has a striking appearance with a reddish-brown head, a buff-colored crown, a gray body, and a white patch on the wings. The female, on the other hand, is a more subdued mottled grayish-brown. Both sexes share a stubby, grayish-blue bill with a black tip.

Male:
• Head: Chestnut (reddish-brown) with a buffy-cream forehead and crown.
• Body: Grayish flanks and back, with a white belly and a pinkish-gray chest.
• Wings: Possess a large white patch on the upper wing coverts, which is visible in flight.
• Bill: Bluish-gray with a black tip.
• Other: Black undertail coverts.

Female:
• Head and Body: A mottled, dull grayish-brown overall.
• Flanks: Often have a reddish-brown tinge, especially on the flanks.
• Belly: White.
• Bill: Similar to the male's, grayish-blue with a black tip.
• Eye: Has a dark smudge around the eye.
• Distinguishing from female American Wigeon: The female Eurasian Wigeon often has a warmer, reddish-brown head and neck, and less contrast between head, breast, and sides compared to the female American Wigeon.