Open3D is an open-source library designed for rapid development of software that handles 3D data, including point clouds, meshes, and RGB-D images. It offers a set of carefully selected data structures and algorithms in both C++ and Python, with a highly optimized backend implemented in C++11 and designed for parallelization using OpenMP. The library is developed with a focus on simplicity and ease of use, minimizing dependencies and maintaining clean, consistent code. Open3D has been used in various research projects and is actively deployed in the cloud. It supports common 3D data processing workflows and is released under the MIT license, welcoming contributions from the open-source community. The library includes modules for data handling, visualization, registration, and reconstruction, with optimized implementations that are significantly faster than those in other libraries like PCL. Open3D is available at http://www.open3d.org and is maintained through a clear code review process.Open3D is an open-source library designed for rapid development of software that handles 3D data, including point clouds, meshes, and RGB-D images. It offers a set of carefully selected data structures and algorithms in both C++ and Python, with a highly optimized backend implemented in C++11 and designed for parallelization using OpenMP. The library is developed with a focus on simplicity and ease of use, minimizing dependencies and maintaining clean, consistent code. Open3D has been used in various research projects and is actively deployed in the cloud. It supports common 3D data processing workflows and is released under the MIT license, welcoming contributions from the open-source community. The library includes modules for data handling, visualization, registration, and reconstruction, with optimized implementations that are significantly faster than those in other libraries like PCL. Open3D is available at http://www.open3d.org and is maintained through a clear code review process.