Formal verification is of crucial significance in the development of hardware and software systems. In the last few years, tremendous progress was made in both the speed and capacity of constraint technology. Most notably, SAT solvers have become orders of magnitude faster and capable of handling problems that are orders of magnitude bigger, thus enabling the formal verification of more complex computer systems. As a result, the formal verification of hardware and software has become a promising area for research and industrial applications. The main goals of the Constraints in Formal Verification workshop are to bring together researchers from the CSP/SAT and the formal verification communities, to describe new applications of constraint technology to formal verification, to disseminate new challenging problem instances, and to propose new dedicated algorithms for hard formal verification problems. This workshop will be of interest to researchers from both academia and industry, working on constraints or on formal verification and interested in the application of constraints to formal verification.