Is Fantasy Football Gambling?

In short, NO!

Unlawful Internet Gambling Enforcement Act of 2006

The Unlawful Internet Gambling Enforcement Act of 2006, which was an amendment to the larger and unrelated Safe Port Act, included "carve out" language that clarified the legality of fantasy sports. It was signed into law on October 13, 2006 by President George W. Bush. The Unlawful Internet Gambling Enforcement Act makes transactions from banks or similar institutions to online gambling sites illegal, with the notable exceptions of fantasy sports, online lotteries and horse/harness racing.

The bill specifically exempts fantasy sports games, educational games, or any online contest that "has an outcome that reflects the relative knowledge of the participants, or their skill at physical reaction or physical manipulation (but not chance), and, in the case of a fantasy or simulation sports game, has an outcome that is determined predominantly by accumulated statistical results of sporting events…"

Just to simplify, Fantasy Football is a game of skill, not chance; therefore, it is legal.