DLL may refer to:
In computer programming, DLL injection is a technique used for running code within the address space of another process by forcing it to load a dynamic-link library.
Delta-like 3 (Drosophila), also known as DLL3, is a protein which in humans is encoded by the DLL3 gene.
Delta-like 4 is a protein that in humans is encoded by the DLL4 gene.
Dynamic-link library (or DLL) is Microsoft's implementation of the shared library concept in the Microsoft Windows and OS/2 operating systems.
Platform Invocation Services, commonly referred to as P/Invoke, is a feature of Common Language Infrastructure implementations, like Microsoft's Common Language Runtime, that enables managed code to call native code.
The David L. Lawrence Convention Center (DLLCC) is a 1,500,000-square-foot (140,000 m2) convention, conference and exhibition building in downtown Pittsburgh in the U.S.
VMware ThinApp (formerly Thinstall) is an application virtualization and portable application creator suite by VMware that can package conventional applications so that they become portable applications.