Ardour is a hard disk recorder and digital audio workstation application that runs on Linux, macOS, FreeBSD and Microsoft Windows. Its primary author is Paul Davis, who was also responsible for the JACK Audio Connection Kit. It is intended as a digital audio workstation suitable for professional use.

It is free software, released under the terms of the GPL-2.0-or-later.

Ardour's recording abilities are limited by only the hardware it is run on; there are no built-in limits in its capabilities.[clarification needed] When recording on top of existing media, it can perform latency compensation, positioning recorded material where it was intended to be when recording it. Monitoring options include self-monitoring, external hardware support (dependent on sound card support), and specialized hardware support (e.g. JACK Audio Connection Kit). Self-monitoring makes it possible to apply plug-in effects while recording. Using the JACK audio, Ardour can record concurrently from both the audio card and compatible software.