Harefield Marina is a well-established canal marina situated at Bridge 180 on the Grand Union Canal, near Harefield in Middlesex, just west of Uxbridge in the London Borough of Hillingdon.

Run as a family business since 1986 under Musk Marine Sales, it offers around 200 non-residential rural moorings for narrowboats and cruisers in a secluded countryside setting surrounded by lakes and wildlife.

It lies roughly one day's cruising from the River Thames and is conveniently close to the M25 and M40.

The marina serves as a practical access point and service hub on this stretch of the Grand Union, with facilities including a slipway, chandlery, diesel, pump-out, water and electric points, hull blacking, engine servicing, and boat sales.

Positioned between Troy Junction to the northwest and Cowley Peachey Junction to the south, it provides a useful staging point for boaters navigating the main line of the Grand Union Canal.