Michael Rowan Hamilton John O'Regan OBE (born c. 1947) is a British businessman and the co-founder of RM plc.

O'Regan graduated with an economics degree from Cambridge University.

In 1973, with Mike Fischer (who had a physics degree from Oxford), O'Regan co-founded Research Machines, a British microcomputer and then software company for the educational market. He was an executive director until 1992, when he became a non-executive director. He has been a non-executive director of a number of other companies as well, including the Oxford Technology Venture Capital Trusts.

O'Regan was awarded an honorary degree by Oxford Brookes University in 1999.^[1] With RM co-founder, Mike Fischer O'Regan was awarded an honorary degree by the Open University in 2002.^[2]

O'Regan was awarded an OBE in the Queen's Birthday Honours in 2000.^[3] He was a governor of Oxford Brookes University and of The Oxford Academy Trust, and a Deputy Lieutenant of Oxfordshire from 2003 until 2014 when he and his wife Jane moved to Wiltshire. ^{[citation needed]}

O'Regan is the founder and Chair of Hamilton Trust which ran Maths Year 2000 for the British government, and co-founded early years charity Peeple.