The Green Stripe (Portrait of Madame Matisse) was painted by Henri Matisse in 1905, during a pivotal period in his career when he was developing the style that would become known as Fauvism. The subject is Amélie Matisse, the artist's wife, depicted in a frontal bust-length portrait. The painting is notable for its experimental use of color and bold brushwork, which marked a radical departure from traditional portraiture of the era. The composition centers on the sitter’s face, divided by a vivid green band running vertically down the forehead and nose, which gives the painting its title.

The background is rendered in flat planes of contrasting colors—pink, orange, and green—while the face and clothing are modeled with broad, visible strokes of unmixed pigment. The use of non-naturalistic color emphasizes the structure of the face and conveys emotional intensity, while the simplified forms and strong outlines reflect the influence of Post-Impressionism. The painting is regarded as one of the key works of Fauvism. The painting has since become one of the most recognized works of early twentieth-century modernism.

It is held today in the Statens Museum for Kunst, Copenhagen.