D-Orbit (as in de-orbit) is a private aerospace company headquartered in Italy with subsidiaries in Portugal, UK, US and a joint venture in the US, D-Orbit USA.

D-Orbit is mainly active in the Space tug also known as orbital transfer vehicle (OTV) market. While this concept has existed for several decades, it is only in the last few years that more examples are being produced and used.

D-Orbit has been operating commercial ION missions since September 2020, deploying satellites for customers like Planet Labs, EnduroSat, Elecnor Deimos, University of Southern California, SatRevolution, and Kleos, and operating payloads for the German HPS, High Performance Space Structure Systems, the Instituto de Astrofísica de Canarias (IAC), and the Swiss data security company Cysec SA.

D-Orbit was founded in 2011 by Luca Rossettini, currently serving as chief executive officer (CEO), and Renato Panesi, currently serving as chief commercial officer (CCO).

The company's initial focus was the development of a smart and autonomous decommissioning motor for satellites and launcher stages called D3 (D-Orbit Decommissioning Device). In 2015, the D3 project was partially funded by the European Union under the framework of Horizon 2020.

This provided the origin of the D-orbit name, being just a contraction of the term "de-orbit", which denotes an orbital manoeuver that pulls a spacecraft out of its operational orbit and inserts it into a reentry trajectory that will eventually cause it to burn up upon atmospheric entry.

In 2017, the company began the development of ION Satellite Carrier, an orbital transfer vehicle able to host a batch of satellites, transport them across orbits, and release each one of them, individually, into a custom orbital slot and operate third-party payloads. The OTV performed its first commercial mission in September 2020.

In 2022, the company planned to go public via a SPAC with a valuation of $1.4bn, however this was cancelled.