Original post by clh_hilaryOff the top of my head, Oxbridge both offer at least:
Master of Biochemistry (MBiochem)
Master of Chemistry (MChem)
Master of Computer Science (MCompSci)
Master of Computer Science and Philosophy (MCompPhil)
Master of Earth Sciences (MEarthSc)
Master of Engineering (MEng)
Master of Mathematics (MMath)
Master of Mathematics and Computer Science (MMathCompSci)
Master of Mathematics and Philosophy (MMathPhil)
Master of Physics (MPhys)
Master of Physics and Philosophy (MPhysPhil)
Master of Earth Sciences (MEarthSci)
These are all four-year undergraduate degrees. Students submit only one dissertation altogether.
Alternatively, Oxford offers these master's degrees in the name of a bachelor's degree:
Bachelor of Divinity (BD)
Bachelor of Medicine & Bachelor of Surgery (BMBCh)
Bachelor of Civil Law (BCL)
Bachelor of Music (BMus)
These are actual master's degrees despite their names. Graduates can choose to have them awarded with the 'master' title should they wish to.
All other undergraduates at Oxbridge are awarded a Bachelor of Arts (and Trinity College Dublin, too). Seven years after matriculation (Oxford) or two years after graduation (Cambridge) these BAs got converted into Masters of Arts on a small payment to their own colleges.
These all are because in the past undergraduate studies took seven years, and people were basically awarded the BA when they matriculate and end with an MA in the end. The MA is also a 'status' especially at Oxford which entitles you to special rights, although most of those rights have now been extended to all degree graduates with the exception of vote membership at the University Parliament, where only MAs and DPhils (the Oxford way of calling a PhD) can vote. That doesn't actually change anything however, as all academics at or above the level of lectureship get an automatic Master of Arts. What people would consider MAs at Oxford are called Master of Studies (MSt). Alternatively, people can go for other master's degrees such as a Master of Science (MSc) or a Master of Philosophy (MPhil) (which sometimes could be a failed DPhil). At Cambridge, they have additional ones for their part-time degrees, such as Master of Education (MEd), when full-time students would be getting an MPhil instead.
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Undergraduate masters are also prominent especially in the four ancient universities in Scotland, ie University of Edinburgh, University of St Andrews, University of Glasgow, and University of Aberdeen. They all take four years to complete, but I believe only apply to first degrees.
These 'masters' are not considered proper master's degrees for the simple fact that they do not require master's level work, nor do they have the same teaching/study focus/nature or a second thesis turned in.