The +Teamgeist ball was the official football for the 2006 FIFA World Cup in Germany. The plus sign in its name was introduced for trademark purposes, since the regular German word Teamgeist, meaning "team spirit", could not be trademarked.

The ball was designed by the Adidas Innovation Team and the Molten Corporation and is made by Adidas, which has provided the balls used in all World Cup matches since the 1970 World Cup when the Telstar was introduced.

The +Teamgeist ball differs from previous balls in having just 14 curved panels (making the ball topologically equivalent to a truncated octahedron), rather than the 32 that have been standard since 1970. Like the 32 panel Roteiro which preceded it, the +TeamGeist panels are bonded together, rather than stitched. It is claimed to be rounder and to perform more uniformly regardless of where it is hit, and being almost waterproof, it does not get heavier in wet weather.