oneDPL uses namespace oneapi::dpl and a shorter variant namespace dpl for all functionality including parallel algorithms, oneDPL execution policies, etc. For the subset of the standard C++ library for kernels, the standard class and function names are also aliased in namespace oneapi::dpl.

oneDPL uses nested namespaces for the functionality aligned with C++ standard. The names of those namespaces are the same as in namespace std. For example, oneDPL execution policies are provided in namespace oneapi::dpl::execution.