(VSE, formerly DOS/VSE) is a multitasking, ibm 370-architected operating system similar to multiple virtual storage (MVS).

VSE run jobs in partitions rather than address spaces, and uses power for input/output rather than jes, but is largely similar to MVS. Subsequent VSE/esa releases gave VSE the xa-370 channel architecture, 31-bit virtual and real storage support, and data spaces. VSE is the ibm operating system on one-third of installed ibm 4381s and a significant proportion of ibm 9370s as well. It offers transaction processing and batch processing capabilities well beyond virtual machine's current capabilities, and has a close affinity with MVS.