---
title: Open Service Mesh (OSM)
software:
- osm
labels:
  category: servicemesh
  layer: network
tutorials:
- https://release-v1-2.docs.openservicemesh.io/docs/guides/integrations/external_auth_opa/
docs_features:
  envoy:
    note: |
      External Authorization supports OPA and is documented
      [here](https://release-v1-2.docs.openservicemesh.io/docs/guides/integrations/external_auth_opa/)
---

Open Service Mesh is a lightweight and extensible cloud native service mesh.
