Mark Timothy O'Shea MBE (born 9 May 1956) is an English herpetologist, photographer, author, lecturer, and television personality.

In 2006 O'Shea designed a set of six postage stamps called "The Dangerous Snakes of Papua New Guinea", for Post PNG.

An additional goal was to assist government policy-makers and to educate the citizens of Asia's newest country as they tackle issues related to conservation and sustainability.

He has also contributed chapters to books on subjects ranging from rainforest ecology to snakebite, and written numerous popular and scientific articles.

In July 2010 the IHS awarded O'Shea with a life membership and fellowship for his "contributions to the Society and herpetology in general".

In September 2002 O'Shea received an honorary Doctor of Science degree from the University of Wolverhampton, for "services to herpetology".

He was appointed Member of the Order of the British Empire (MBE) in the 2020 Birthday Honours for services to higher education, zoology, reptile conservation and snakebite research.