| 98FM Metropolitan Cup (J1) |
| 01/04/2012 |
| Clontarf | 41 | vs | 26 | Lansdowne | | More |
| Referee : Glenn Sheridan Venue : Castle Avenue |
| 25/03/2012 |
| Monkstown | 27 | vs | 32 | Lansdowne | | More |
| Referee : Ciaran McGowan Venue : Sydney Parade |
| Purcell Cup (Under 21) |
| 17/04/2012 |
| UCD | 14 | vs | 10 | Lansdowne | | More |
| Referee : Danny Wallace Venue : Donnybrook |
| 01/04/2012 |
| Wanderers | 13 | vs | 35 | Lansdowne | | More |
| Referee : Garreth Crawford Venue : Merrion Rd |
| 25/03/2012 |
| Lansdowne | 38 | vs | 23 | Old Belvedere | | More |
| Referee : Garreth Crawford Venue : Lansdowne Road |
| 11/03/2012 |
| St Marys College RFC | 3 | vs | 43 | Lansdowne | | More |
| Referee : Gareth Steed Venue : Templeville Rd |
| McCorry Cup (Under 21) |
| 27/04/2012 |
| Lansdowne | 24 | vs | 29 | UCD | | More |
| Referee : Brian Montayne Venue : Donnybrook |
| 15/04/2012 |
| Lansdowne | 34 | vs | 31 | Blackrock College RFC | | More |
| Referee : Gary Conway Venue : Belfield Thornfield |
| 11/03/2012 |
| Clontarf | 13 | vs | 15 | Lansdowne | | More |
| Referee : Gary Conway Venue : Castle Avenue |
| Albert O'Connell Cup (Metro J2) |
| 14/04/2012 |
| St Marys College RFC | 16 | vs | 20 | Lansdowne | | More |
| Referee : Aidan Fogarty Venue : Donnybrook |
| 31/03/2012 |
| Lansdowne | 16 | vs | 0 | Malahide | | More |
| Referee : Kevin O'Boyle Venue : Coolmine RFC |
| 26/03/2012 |
| Lansdowne | 15 | vs | 8 | Guinness | | More |
| Referee : Carl O Meara Venue : Lansdowne Road |
| 07/03/2012 |
| Lansdowne | 34 | vs | 0 | Bective Rangers | | More |
| Referee : James Fitzgerald Venue : Lansdowne Road |
| Moran Cup (Metro J3) |
| 13/04/2012 |
| Terenure College RFC | 8 | vs | 25 | Lansdowne | | More |
| Referee : Tom Keating Venue : Donnybrook |
| 30/03/2012 |
| St Marys College RFC | 19 | vs | 23 | Lansdowne | | More |
| Referee : Sean Rochford Venue : Templeville Rd |
| 23/03/2012 |
| Lansdowne | 32 | vs | 19 | Blackrock College RFC | | More |
| Referee : Eoin Halpin Venue : Lansdowne Road |
| 09/03/2012 |
| Lansdowne | 48 | vs | 28 | Greystones | | More |
| Referee : John Flynn Venue : Lansdowne Road |
| Winters Cup (Metro J4) |
| 31/03/2012 |
| Terenure College RFC | 14 | vs | 13 | Lansdowne | | More |
| Referee : David Stronge Venue : Lakelands Park |
| 24/03/2012 |
| Lansdowne | 50 | vs | 10 | Railway Union | | More |
| Referee : Martin Farrelly Venue : Lansdowne Road |
| 10/03/2012 |
| Old Belvedere | 15 | vs | 17 | Lansdowne | | More |
| Referee : Pat Dempsey Venue : Anglesea Road |
| Leinster Senior League Cup - Section A |
| 17/09/2011 |
| Lansdowne | 17 | vs | 26 | Old Belvedere | | More |
| Referee : Brian MacNeice Venue : Lansdowne Road |
| 10/09/2011 |
| Terenure College RFC | 19 | vs | 35 | Lansdowne | | More |
| Referee : Nigel Correll Venue : Lakelands Park |
| 03/09/2011 |
| Lansdowne | 21 | vs | 17 | Blackrock College RFC | | More |
| Referee : Kevin Beggs Venue : Lansdowne Road |
| 28/08/2011 |
| Bective Rangers | 11 | vs | 8 | Lansdowne | | More |
| Referee : Danny Wallace Venue : Donnybrook |
| Metro J1 League - Section A |
| 04/03/2012 |
| Lansdowne | 17 | vs | 51 | Clontarf | | More |
| Referee : Damian Poder Venue : Lansdowne Road |
| 26/02/2012 |
| St Marys College RFC | 51 | vs | 12 | Lansdowne | | More |
| Referee : Noel Brannigan Venue : Templeville Rd |
| 20/02/2012 |
| Lansdowne | 22 | vs | 31 | Old Belvedere | | More |
| Referee : Mark Scoyne Venue : Anglesea Road |
| 22/01/2012 |
| UCD | 31 | vs | 37 | Lansdowne | | More |
| Referee : Duncan Duke Venue : Belfield |
| 15/01/2012 |
| Bective Rangers | 20 | vs | 26 | Lansdowne | | More |
| Referee : Barry Armstrong Venue : Donnybrook |
| 12/12/2011 |
| Lansdowne | 44 | vs | 6 | Dublin University | | More |
| Referee : Ger English Venue : Lansdowne Road |
| 05/12/2011 |
| Clontarf | 66 | vs | 7 | Lansdowne | | More |
| Referee : Danny Wallace Venue : Castle Avenue |
| 21/11/2011 |
| Lansdowne | 18 | vs | 21 | St Marys College RFC | | More |
| Referee : Nigel Correll Venue : Lansdowne Road |
| 06/11/2011 |
| Lansdowne | 11 | vs | 0 | UCD | | More |
| Referee : David Petherbridge Venue : Ballycorus Rd |
| 22/10/2011 |
| Lansdowne | 12 | vs | 13 | Bective Rangers | | More |
| Referee : Ian Duffy Venue : Ballycorus Rd |
| 15/10/2011 |
| Old Belvedere | 14 | vs | 14 | Lansdowne | | More |
| Referee : Niall Behan Venue : Anglesea Road |
| 09/10/2011 |
| Dublin University | 0 | vs | 19 | Lansdowne | | More |
| Referee : Tom Tuohy Venue : College Park |
| JP Fanagan Premier |
| 26/02/2012 |
| Lansdowne | 16 | vs | 25 | Old Belvedere | | More |
| Referee : Paul Haycock Venue : Lansdowne Road |
| 19/02/2012 |
| Lansdowne | 24 | vs | 12 | St Marys College RFC | | More |
| Referee : Eanna O'Dowd Venue : Lansdowne Road |
| 29/01/2012 |
| Lansdowne | 21 | vs | 18 | Dublin University | | More |
| Referee : Noel Brannigan Venue : Lansdowne Road |
| 22/01/2012 |
| UCD | 41 | vs | 11 | Lansdowne | | More |
| Referee : Richard Carson Venue : Belfield |
| 15/01/2012 |
| Lansdowne | 45 | vs | 15 | Blackrock College RFC | | More |
| Referee : John Montayne Venue : Lansdowne Road |
| 08/01/2012 |
| St Marys College RFC | 21 | vs | 29 | Lansdowne | | More |
| Referee : Glenn Sheridan Venue : Templeville Rd |
| 04/12/2011 |
| Lansdowne | 25 | vs | 12 | UCD | | More |
| Referee : Sean Gallagher Venue : Lansdowne Road |
| 13/11/2011 |
| Lansdowne | 55 | vs | 5 | Old Wesley | | More |
| Referee : Steve McCann Venue : Lansdowne Road |
| 06/11/2011 |
| Clontarf | 12 | vs | 24 | Lansdowne | | More |
| Referee : Aidan Fogarty Venue : Castle Avenue |
| 23/10/2011 |
| Lansdowne | 46 | vs | 12 | Terenure College RFC | | More |
| Referee : Niall Behan Venue : Lansdowne Road |
| 16/10/2011 |
| Dublin University | 6 | vs | 20 | Lansdowne | | More |
| Referee : Noel Brannigan Venue : College Park |
| 09/10/2011 |
| Old Belvedere | 13 | vs | 19 | Lansdowne | | More |
| Referee : Ciaran McGowan Venue : Anglesea Road |
| JP Fanagan Pennant (Phase 1) - Pool 1 |
| 13/11/2011 |
| IT Carlow | 3 | vs | 45 | Lansdowne | | More |
| Referee : Garret Holland Venue : IT Carlow |
| 06/11/2011 |
| Lansdowne | 22 | vs | 6 | Naas | | More |
| Referee : Jim Kelly Venue : Ballycorus Rd |
| 23/10/2011 |
| NUIM Barnhall | 21 | vs | 11 | Lansdowne | | More |
| Referee : Jason Le Lievre Venue : Parsonstown |
| 16/10/2011 |
| Lansdowne | 31 | vs | 21 | Greystones | | More |
| Referee : David Moreau Venue : Ballycorus Rd |
| 09/10/2011 |
| Old Belvedere | 19 | vs | 11 | Lansdowne | | More |
| Referee : Tim Towend Venue : Anglesea Road |
| JP Fanagan Pennant (Phase 2) - Section B |
| 04/03/2012 |
| Lansdowne | | vs | | Old Wesley | | More |
| Referee : Garreth Crawford Venue : Ballycorus Rd |
| 24/02/2012 |
| Lansdowne | 51 | vs | 12 | Suttonians | | More |
| Referee : Richie English Venue : Lansdowne Road |
| 29/01/2012 |
| Seapoint | 20 | vs | 19 | Lansdowne | | More |
| Referee : Gareth Steed Venue : Kilbogget Park Killiney |
| 22/01/2012 |
| Lansdowne | 21 | vs | 18 | NUIM Barnhall | | More |
| Referee : Berney White Venue : Lansdowne Road |
| 13/01/2012 |
| Old Wesley | 3 | vs | 35 | Lansdowne | | More |
| Referee : Ian Thompson Venue : Ballycorus Rd |
| 08/01/2012 |
| Suttonians | 3 | vs | 20 | Lansdowne | | More |
| Referee : Garreth Crawford Venue : John J McDowell Memorial Grounds |
| 27/11/2011 |
| Lansdowne | 53 | vs | 0 | Seapoint | | More |
| Referee : Gordon Murray Venue : Lansdowne Road |
| 23/10/2011 |
| NUIM Barnhall | 21 | vs | 11 | Lansdowne | | More |
| Referee : Venue : Parsonstown |
| Senior Seconds League Cup - Section A |
| 17/09/2011 |
| Lansdowne | 15 | vs | 59 | Old Belvedere | | More |
| Referee : Simon Owens Venue : Lansdowne Road |
| 10/09/2011 |
| Terenure College RFC | 27 | vs | 13 | Lansdowne | | More |
| Referee : Roland Clear Venue : Lakelands Park |
| 03/09/2011 |
| Lansdowne | | vs | | Blackrock College RFC | | More |
| Referee : Venue : Lansdowne Road |
| 28/08/2011 |
| Bective Rangers | 10 | vs | 17 | Lansdowne | | More |
| Referee : Bernard Doyle Venue : Donnybrook |
| Metro J2 League (Phase 1) - Pool 1 |
| 05/11/2011 |
| Lansdowne | 68 | vs | 6 | UCD | | More |
| Referee : Eamon Sayers Venue : Lansdowne Road |
| 22/10/2011 |
| CYM | 0 | vs | 81 | Lansdowne | | More |
| Referee : Richie English Venue : Terenure Rd North |
| 15/10/2011 |
| Lansdowne | 23 | vs | 15 | Old Belvedere | | More |
| Referee : Donal Moore Venue : Lansdowne Road |
| 08/10/2011 |
| St Marys College RFC | 22 | vs | 22 | Lansdowne | | More |
| Referee : Simon Owens Venue : Templeville Rd |
| Metro J2 League (Phase 2) - Section A |
| 18/02/2012 |
| Lansdowne | | vs | | Clontarf | | More |
| Referee : Wayne Sheridan Venue : Lansdowne Road |
| 03/02/2012 |
| Lansdowne | 38 | vs | 17 | Stillorgan | | More |
| Referee : Garret Holland Venue : Lansdowne Road |
| 14/01/2012 |
| Old Belvedere | 15 | vs | 35 | Lansdowne | | More |
| Referee : Mark Power Venue : Anglesea Road |
| 07/01/2012 |
| Lansdowne | 22 | vs | 8 | St Marys College RFC | | More |
| Referee : Alex Stavely Venue : Lansdowne Road |
| 03/12/2011 |
| Clontarf | 9 | vs | 50 | Lansdowne | | More |
| Referee : Mark Power Venue : Castle Avenue |
| 26/11/2011 |
| Stillorgan | 16 | vs | 50 | Lansdowne | | More |
| Referee : David Moreau Venue : CUS Sportsground Clonskeagh |
| 19/11/2011 |
| Lansdowne | 62 | vs | 3 | Old Wesley | | More |
| Referee : Mark Power Venue : Ballycorus Rd |
| 15/10/2011 |
| Lansdowne | 23 | vs | 15 | Old Belvedere | | More |
| Referee : Venue : Lansdowne Road |
| 08/10/2011 |
| St Marys College RFC | 22 | vs | 22 | Lansdowne | | More |
| Referee : Venue : Templeville Rd |
| Leinster J3 League - Section A |
| 02/03/2012 |
| Old Wesley | 13 | vs | 11 | Lansdowne | | More |
| Referee : Helen O'Reilly Venue : Donnybrook |
| 17/02/2012 |
| Lansdowne | 56 | vs | 7 | Greystones | | More |
| Referee : Ultan Ryan Venue : Lansdowne Road |
| 03/02/2012 |
| Old Belvedere | 16 | vs | 31 | Lansdowne | | More |
| Referee : David Moreau Venue : Anglesea Road |
| 27/01/2012 |
| Lansdowne | 25 | vs | 15 | Terenure College RFC | | More |
| Referee : Sean Rochford Venue : Lansdowne Road |
| 13/01/2012 |
| Lansdowne | 27 | vs | 21 | St Marys College RFC | | More |
| Referee : Donagh McGowan Venue : Lansdowne Road |
| 06/01/2012 |
| Lansdowne | 58 | vs | 5 | Suttonians | | More |
| Referee : Barry Neary Venue : Lansdowne Road |
| 09/12/2011 |
| Lansdowne | 62 | vs | 12 | Blackrock College RFC | | More |
| Referee : Declan Holmes Venue : Lansdowne Road |
| 02/12/2011 |
| Lansdowne | 17 | vs | 19 | Old Wesley | | More |
| Referee : Hubie Gallagher Venue : Lansdowne Road |
| 25/11/2011 |
| Greystones | 3 | vs | 37 | Lansdowne | | More |
| Referee : David Stronge Venue : Dr Hickey Park |
| 11/11/2011 |
| Lansdowne | 32 | vs | 24 | Old Belvedere | | More |
| Referee : Paul McSweeney Venue : Lansdowne Road |
| 06/11/2011 |
| Terenure College RFC | 19 | vs | 7 | Lansdowne | | More |
| Referee : Garret Holland Venue : Lakelands Park |
| 21/10/2011 |
| St Marys College RFC | 16 | vs | 27 | Lansdowne | | More |
| Referee : Donagh McGowan Venue : Templeville Rd |
| 14/10/2011 |
| Suttonians | 0 | vs | 44 | Lansdowne | | More |
| Referee : Humphrey Jones Venue : John J McDowell Memorial Grounds |
| 09/10/2011 |
| Blackrock College RFC | 19 | vs | 30 | Lansdowne | | More |
| Referee : Hubie Gallagher Venue : Stradbrook |
| Leinster J4 League Section A (Phase 1) - Pool 2 |
| 19/11/2011 |
| Lansdowne | 19 | vs | 11 | Terenure College RFC | | More |
| Referee : Sean Rochford Venue : Ballycorus Rd |
| 05/11/2011 |
| Lansdowne | 16 | vs | 11 | Old Belvedere | | More |
| Referee : Tom Walsh Venue : Ballycorus Rd |
| 22/10/2011 |
| NUIM Barnhall A | 31 | vs | 10 | Lansdowne | | More |
| Referee : Donal Brady Venue : Parsonstown |
| 15/10/2011 |
| Stillorgan | 0 | vs | 11 | Lansdowne | | More |
| Referee : Jonathan Geoghegan Venue : CUS Sportsground Clonskeagh |
| 08/10/2011 |
| Lansdowne | 25 | vs | 22 | Clontarf | | More |
| Referee : Grahame Douglas Venue : Lansdowne Road |
| Leinster J4 League Section A (Phase 2) - Premier Division |
| 03/03/2012 |
| Wanderers | 27 | vs | 25 | Lansdowne | | More |
| Referee : Greg Wynne Venue : Merrion Rd |
| 18/02/2012 |
| Lansdowne | 10 | vs | 26 | Greystones | | More |
| Referee : Martin Farrelly Venue : Ballycorus Rd |
| 04/02/2012 |
| Old Belvedere | 0 | vs | 29 | Lansdowne | | More |
| Referee : Carl O Meara Venue : Anglesea Road |
| 28/01/2012 |
| Lansdowne | 13 | vs | 3 | NUIM Barnhall A | | More |
| Referee : Martin Kavanagh Venue : Ballycorus Rd |
| 14/01/2012 |
| St Marys College RFC | 17 | vs | 5 | Lansdowne | | More |
| Referee : Martin Farrelly Venue : Templeville Rd |
| 07/01/2012 |
| Lansdowne | 3 | vs | 5 | Wanderers | | More |
| Referee : Mick Lennon Venue : Ballycorus Rd |
| 10/12/2011 |
| Greystones | 72 | vs | 0 | Lansdowne | | More |
| Referee : Ian Hayes Venue : Dr Hickey Park |
| 03/12/2011 |
| Lansdowne | 12 | vs | 20 | St Marys College RFC | | More |
| Referee : Pat Dempsey Venue : Ballycorus Rd |
| 05/11/2011 |
| Lansdowne | 16 | vs | 11 | Old Belvedere | | More |
| Referee : Venue : Ballycorus Rd |
| 22/10/2011 |
| NUIM Barnhall A | 31 | vs | 10 | Lansdowne | | More |
| Referee : Venue : Parsonstown |
