The opposite of brown on the color wheel is dark blue. Brown is only included on more detailed color wheels that feature many hues of color.
Brown is a tertiary color, which means that it is formed by combining either two secondary colors or one secondary color and one primary color. Brown is created with different combinations of oranges, reds and yellows. Depending on the specific brown hue, its opposite on the color wheel may also be a deep violet or a deep blue-green color. Colors that are opposite each other on the color wheel are generally complementary, meaning they go well together in decor, art or fashion.