To dream of a hawk represents knowing what you want and taking it. It also reflects swift action and sound judgment. Noticing what someone else has and insensitivity taking it from them whenever you want. Never allowing a person or situation to get in your way if it's too important.
Negatively, a hawk may symbolize predatory instincts. You or someone else may be coming on too strong. An "as*hole" that takes what he wants.
Example: A man dreamed of seeing a hawk sitting on a fence with another bird it had just killed. In waking life he was considering taking serious action against a friend that has screwed him over.