O
| O’Brien, Stephen Eddisbury | C |
| O’Donnell, Fiona East Lothian | Lab |
| Offord, Matthew Hendon | C |
| Ollerenshaw, Eric Lancaster & Fleetwood | C |
| Onwurah, Chi Newcastle upon Tyne Central | Lab |
| Opperman, Guy Hexham | C |
| Osborne, Sandra Ayr, Carrick & Cumnock | Lab |
| Osborne, George Tatton | C |
| Ottaway, Richard Croydon South | C |
| Owen, Albert Ynys Mon | Lab |
P
| Paice, Jim Cambridgeshire South East | C |
| Paisley, Ian Junior Antrim North | DUP |
| Parish, Neil Tiverton & Honiton | C |
| Patel, Priti Witham | C |
| Paterson, Owen Shropshire North | C |
| Pawsey, Mark Rugby | C |
| Pearce, Teresa Erith & Thamesmead | Lab |
| Penning, Mike Hemel Hempstead | C |
| Penrose, John Weston-super-Mare | C |
| Percy, Andrew Brigg & Goole | C |
| Perkins, Toby Chesterfield | Lab |
| Perry, Claire Devizes | C |
| Phillips, Stephen Sleaford & North Hykeham | C |
| Phillipson, Bridget Houghton & Sunderland South | Lab |
| Pickles, Eric Brentwood & Ongar | C |
| Pincher, Christopher Tamworth | C |
| Poulter, Daniel Suffolk Central & Ipswich North | C |
| Pound, Stephen Ealing North | Lab |
| Primarolo, Dawn Bristol South | Lab |
| Prisk, Mark Hertford & Stortford | C |
| Pritchard, Mark Wrekin, The | C |
| Pugh, John Southport | LD |
Q
| Qureshi, Yasmin Bolton South East | Lab |
R
| Raab, Dominic Esher & Walton | C |
| Randall, John Uxbridge & Ruislip South | C |
| Raynsford, Nick Greenwich & Woolwich | Lab |
| Reckless, Mark Rochester & Strood | C |
| Redwood, John Wokingham | C |
| Reed, Jamie Copeland | Lab |
| Rees-Mogg, Jacob Somerset North East | C |
| Reevell, Simon Dewsbury | C |
| Reeves, Rachel Leeds West | Lab |
| Reid, Alan Argyll & Bute | LD |
| Reynolds, Jonathan Stalybridge & Hyde | Lab |
| Reynolds, Emma Wolverhampton North East | Lab |
| Rifkind, Sir Malcolm Kensington | C |
| Riordan, Linda Halifax | Lab |
| Ritchie, Margaret Down South | SDLP |
| Robathan, Andrew Leicestershire South | C |
| Robertson, Hugh Faversham & Kent Mid | C |
| Robertson, John Glasgow North West | Lab |
| Robertson, Angus Moray | SNP |
| Robertson, Laurence Tewkesbury | C |
| Robinson, Geoffrey Coventry North West |