Mansfield and Sutton Astronomical Society (MSAS) is an amateur astronomical society in the East Midlands of England. It was formed in 1969. It is based at Sherwood Observatory, a 61 cm mirror telescope which it owns and operates. The observatory lies 4 km south west of the centre of Mansfield on one of the highest points in the county of Nottinghamshire.

The society is a member of The Federation of Astronomical Societies.

The aims of the society are to:

• further the interests of Astronomy and related subjects within the local community
• introduce the public to the subject of Astronomy
• provide a forum for education in Astronomy and observational techniques through a collaboration with the University of Nottingham
• provide members with the best observational equipment possible.

The society holds monthly members-only lecture meetings at the observatory, along with observing and training evenings for members.

The society runs a night school for those who wish to learn about astronomy and the universe. These are usually held at the observatory on Friday evenings.

MSAS is a registered charity. It is funded through member subscriptions, fund raising events, public open evenings held at the society's Observatory, charitable donations and grants.

The patrons of the society are:

• Professor Sir Francis Graham Smith, 13th Astronomer Royal (1982-1990).
• Professor Michael R. Merrifield, School of Physics and Astronomy, University of Nottingham.

• List of astronomical societies

• Mansfield and Sutton Astronomical Society Official website.
• Mansfield & Sutton Astronomical Society Yahoo Distribution Group.
• Federation of Astronomical Societies (FAS).