This volume contains the proceedings of the 7th Workshop on Hybrid Systems: Computation and Control (HSCC 2004) held in Philadelphia, USA, from March 25 to 27, 2004. The annual workshop on hybrid systems attracts researchers from academia and industry interested in modeling, analysis, and implemen- tion of dynamic and reactive systems involving both discrete and continuous behaviors. The previous workshops in the HSCC series were held in Berkeley, USA(1998), Nijmegen, TheNetherlands(1999), Pittsburgh, USA(2000), Rome, Italy (2001), Palo Alto, USA (2002), and Prague, Czech Republic (2003)....