L
- James Larkin (1874–1947): IWL TD Dublin North 1927, Ind TD Dublin North–East 1937–1938, Lab TD Dublin North–East 1943–1944
- James Snr's son James Larkin, Jnr (1904–1969): Lab TD Dublin South 1943–1948, Dublin South–Central 1948–1954
- James Snr's son Denis Larkin (1908–1987): Lab TD Dublin North–East 1954–1961, 1965–1969
- Hugh Law (1818–1883) Liberal MP Londonderry 1874–1881
- his grandson Hugh Law (1872–1943) IPP MP West Donegal 1902–1918, CnaG TD Donegal 1927–1932
- Patsy Lawlor (1933–1998): FG Senator 1981–1983
- her son Anthony Lawlor FG TD Kildare North 2011–
- Seán Lemass (1899–1971): FF TD Dublin 1924–1969
- his son Noel Lemass, Jnr (1929–1976): FF TD Dublin South–West 1956–1976
- Noel's wife Eileen Lemass (born 1932): FF TD Dublin South–West 1977–1987, MEP Dublin 1984–1989
- Seán's grandson Seán O'Connor (born 1960): FF Senator 1982–83
- his son-in-law Charles Haughey (1925–2006): FF TD Dublin North–East/Dublin Artane/Dublin North–Central 1957–1992
- Charles' son Seán Haughey (born 1961): FF Senator 1987–1992, FF TD Dublin North–Central 1992–2011
- Brian Lenihan, Snr (1930–1995): FF Senator 1957–1961, 1973–1977, FF TD Roscommon 1961–1969, Roscommon–Leitrim 1969–1973, Dublin West 1977–1997, MEP 1973–1977
- Brian Snr's father Patrick Lenihan (1902–1970): FF TD Longford–Westmeath 1965–1970
- Brian Snr's sister Mary O'Rourke (born 1937): FF Senator 1981–1982, 2002–2007, FF TD Longford–Westmeath 1982–1997, 2007–2011, Westmeath 1997–2002
- Brian Snr's son Brian Lenihan, Jnr (1959–2011): FF Dublin West 1996–2011
- Brian Snr's son Conor Lenihan (born 1963): FF TD Dublin South–West 1997–2011
- Jimmy Leonard (born 1927): FF TD Cavan–Monaghan 1973–1981, Feb 1982–1997, Senator 1981–1982
- his daughter Ann Leonard (born 1969): FF Senator 1997–2002
- Patrick Little (1884–1963): FF TD Waterford 1927–1954
- his grandnephew Ciarán Cuffe (born 1963): GP TD Dún Laoghaire 2002–2011
- James B. Lynch (died 1954): FF TD Dublin South 1932–1948 Senator 1951–1954
- his wife Celia Lynch (1908–1989): FF TD Dublin South–Central, Dublin North–Central 1954–1977
- Kathleen Lynch (born 1953): DL/Lab TD Cork North–Central 1994–1997, 2002–
- her brother-in-law Ciarán Lynch (born 1964): Lab TD Cork South–Central 2007–
Read more about this topic: Families In The Oireachtas