Direct3D（简称：D3D）是微软公司在Microsoft Windows操作系统上所开发的一套3D绘图编程接口，是DirectX的一部份，目前广为各家显卡所支持。与OpenGL同为电脑绘图软件和电脑游戏最常使用的两套绘图编程接口之一。

1995年2月，微软收购了英国的Rendermorphics公司，将RealityLab 2.0技术发展成Direct3D标准，并集成到Microsoft Windows中，Direct3D在DirectX 3.0开始出现。后来在DirectX 8.0发表时与DirectDraw编程接口合并并改名为DirectX Graphics。

Direct3D is a graphics application programming interface (API) for Microsoft Windows. Direct3D is used to render three-dimensional graphics in applications where performance is important, such as games. Direct3D uses hardware acceleration if it is available on the graphics card, allowing for hardware acceleration of the entire 3D rendering pipeline or even only partial acceleration. Direct3D exposes the advanced graphics capabilities of 3D graphics hardware, including Z-buffering, W-buffering, Stencil buffering , spatial anti-aliasing, alpha blending, colour blending, mipmapping, texture blending, clipping, Culling, atmospheric effects, perspective-correct texture mapping, programmable HLSL shaders and effects. Integration with other DirectX technologies enables Direct3D to deliver such features as video mapping, hardware 3D rendering in 2D overlay planes, and even sprites, providing the use of 2D and 3D graphics in interactive media ties.