Lord Peter Mandelson (Peter Benjamin Mandelson)
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- Lord Matthew Oakeshott, Britain in Europe Campaign Ltd [council member]
- Chris O'Brien, Brit-American Prjct [fellow]
- Denis O'Brien, Euro grp of Trilateral Comm; WEF Global Leaders for Tomorrow [as of 2000]; W.E.F. Davos 2010
- Richard O'Brien, Chatham House [council member]
- Roberto F de Ocampo, Trilateral Comm [exec c'ttee & Asia Pac grp]
- Cornelius Ochmann, Int'l Bertelsmann Forum 2004 [participant]
- Christine Ockrent, Centre for European Reform [member of advisory board]
- Richard O'Connor, Brit-American Prjct [non-exec director]
- Justice Sandra O'Connor, AMEURUS
- Christian Odendahl, Centre for European Reform [chief economist; Berlin representative]; Comm'n on the Single Market at CER [report co-author]
- Clara Marina O'Donnell, Centre for European Reform [research fellow]
- Lord Gus O'Donnell, Ditchley Fdn [governor]; Economist Group [trustee]
- Dr Jürgen Oesterhelt, Ditchley Fdn [non-exec director]
- Arend Oetker, Euro grp of Trilateral Comm
- Günther Oettinger, W.E.F. Davos 2015
- Or Offer, Moon Active Ltd [shareholder]
- Sadako Ogata, Asia Pac grp of Trilateral Comm
- Angela Oh, Brit-American Prjct [fellow]
- Janet O'Hara, Franco-British Colloque Ltd [non-exec director]
- Akio Okawara, Trilateral Comm [exec c'ttee & Asia Pac grp]
- Yoshio Okawara, Asia Pac grp of Trilateral Comm
- Ben Okri, Brit-American Prjct [advisory board]
- John Oldham, B'berg 2010 [*see note]
- Ann O'Leary, Brit-American Prjct [fellow]
- Andrzej Olechowski, B'berg 1999; Trilateral Comm [exec c'ttee & Euro grp]
- Alberto Oliart, Tertulias [chair]
- Craig Oliver, Britain Stronger in Europe ['ran the campaign']
- Sir David Omand, B'berg 2013; Ditchley Fdn [governor]
- Lee Omar, Brit-American Prjct [UK vice-chair; non-exec director]
- Kazuo Omori, Asia Pac grp of Trilateral Comm
- Lord Martin O'Neill, Ditchley Fdn [governor]
- Lady Onora O'Neill, Ditchley Fdn [non-exec director; governor]
- Michael O'Neil, Trilateral Comm [N Am. Director]
- Melanie Onn, Lab Friends of Israel ['LFI supporter']
- Lembit Opik, Inter-Parliamentary Council Against Anti-Semitism [vice-chair]
- Beth Oppenheim, Centre for European Reform [researcher]
- Emily Oppenheimer, Hillary Clinton Reception at The Orangery
- ::: Will Turner, Hillary Clinton Reception at The Orangery
- Prof James Orbinski, B'berg 2011
- Sir Tony O'Reilly, Int'l Advisory Board of Indpndnt News & Media Plc [also Exec Chair]
- ::: A Cameron O'Reilly [1st son of Sir Tony], Indpndnt News & Media Plc [non-exec director]
- ::: Gavin O'Reilly [2nd son of Sir Tony], Indpndnt News & Media Plc [COO & Ireland Managing Dir]
- ::: Tony O'Reilly Jr [3rd son of Sir Tony], Indpndnt News & Media Plc [non-exec director]
- Ahmet Oren, TerraMar Prjct Inc ['founding citizen']
- Michael Oreskes, W.E.F. Davos 2015
- John Ormerod, Design Museum
- Cllr Paul Ormerod, Lambeth Council [Stockwell ward alongside fellow Labour council members Mandelson & Patrick Mitchell, May 1978-]
- Dr Dean Ornish, W.E.F. Davos 2015
- Roy Oron, Moon Active Ltd [shareholder]
- Prof Kevin O'Rourke, Comm'n on the Single Market at CER [commissioner]
- Peter Orszag, B'berg 2010 [*see note]; B'berg 2011; B'berg 2012; N Am. grp of Trilateral Comm
- George Osborne, Arts & Business Ltd [trustee; non-exec director]; B'berg 2008; B'berg 2009; B'berg 2011; B'berg 2013; B'berg 2014; Edward Heath Int'l Lecture Oct 2016; Franco-British Colloque 2010; W.E.F. Davos 2008, 2009, 2012, 2015
- Rex Osborne, British Youth Council ['BYC Int'l Organiser when Mandelson was BYC chair']
- Robin Osmond, Lambeth Council [employee] [social services director 1977-Apr '88]
- William Ostendorff, New Nuclear Challenge Forum of Aspen Institute Central Europe
- Dr Felipe Osterling Parodi, Inter-Parliamentary Council Against Anti-Semitism
- Meghan O'Sullivan, Trilateral Comm [exec c'ttee & N Am. grp]
- Prof Andrew Oswald, Comm'n on the Single Market at CER [commissioner]
- Dr Emanuele Ottolenghi, B'berg 2013; Lab Friends of Israel [LFI briefings author]
- Lord Herman Ouseley, Lambeth Council ['race relations adviser to the council']
- John Oven, LWT/Weekend World [director]
- Judge Hisashi Owada, Ditchley Fdn [governor]
- Ed Owen, Fabian Soc [exec c'ttee]
- Nicholas Owen, Arts & Business Ltd [non-exec director]
- Geraint Owens, Fabian Soc [exec c'ttee]
- Emma Oxford (Elliott), Brit-American Prjct [fellow]
- ::: Michael Elliott, Brit-American Prjct [member]
- Tuncay Özilhan, Int'l Bertelsmann Forum 2004 [participant]