You can block incoming arrows with your shield.
Prerequisites: Dex 13, Shield Proficiency.
Benefit: You must be using a shield to use this feat. Once per round when you would normally be hit with a ranged weapon, you can deflect it so that you take no damage from it. You must be aware of the attack and not flat-footed. Unusually massive ranged weapons, such as boulders hurled by giants, siege weapon attacks, and ranged attacks generated by spell effects (such as acid arrow) can’t be deflected.
Special: A fighter can select Block Arrow as one of his fighter bonus feats.
Source: Heroes of Battle, page 96.