Hammock, who was the University of Wisconsin's assistant head coach from 2011 to 2013, has coached at college level for 11 years and said that he was looking forward to the step up.
"The opportunity to coach at the highest level - and that's what the NFL is - excites me," Hammock told the club's official website. "To come to an organisation that is committed to winning and has a coaching staff that is so respected is a tremendous opportunity, and I'm looking forward to getting started.
"Working with coach John Harbaugh, learning the offense and working with coach Gary Kubiak, and then coaching these outstanding Ravens players, is special. I feel very honoured and fortunate to be here. My wife and I and our two children are looking forward to being part of the Baltimore community."
The Ravens came third in the AFC North with an 8-8 record in 2013.