Langroid is a lightweight, scalable, and principled Python framework designed for effortlessly constructing applications based on LLMs. You can set up agents, equip them with optional components (LLM, vector store, and methods), assign them tasks, and let them collaborate to solve problems by exchanging messages. The inspiration for this multi-agent paradigm comes from the Actor framework (but no prior knowledge is required!). Langroid offers a fresh approach to LLM application development, meticulously designed to simplify the developer experience; it does not use Langchain. We welcome contributions – please refer to the contribution documentation for ideas.