B
- Anthony Barry (1901–1983): FG TD/Senator Cork Borough 1954–1965
- his son Peter Barry (born 1928): FG TD Cork City South–East/Cork City/Cork South–Central 1969–1997
- Peter's daughter Deirdre Clune (born 1959): FG TD Cork South–Central 1997–2002, 2007–2011, Senator 2011–
- his son Peter Barry (born 1928): FG TD Cork City South–East/Cork City/Cork South–Central 1969–1997
- Richard Barry (born 1919): FG TD Cork East/Cork North–East 1953–1981
- his daughter Myra Barry (born 1957): FG TD Cork North–East/Cork East 1979–1987
- John Beirne, Snr (1893–19??): CnaT TD Roscommon 1943–1948
- his son John Beirne, Jnr (died 1967): CnaT TD Roscommon 1948–1961
- Patrick Belton (1885–1945): FF TD Dublin County 1927, CnaG/FG TD Dublin North 1933–1937, FG TD Dublin County 1938–1943
- his son Richard Belton (1913–1974): FG Senator 1969–1973
- his daughter Avril Doyle (born 1949): FG TD/Senator Wexford 1982–2002, MEP Leinster/East 1999–2009
- his son Jack Belton (died 1963): FG TD Dublin North–East 1948–1963
- his son Paddy Belton (1926–1987): FG TD Dublin North–East 1963–1977
- his nephew Luke Belton (1918–2006): FG TD/Senator Dublin North–Central 1965–1987
- his nephew ? Louis Belton (born 1943): FG TD/Senator Longford–Westmeath/Longford–Roscommon 1989–2002
- his son Richard Belton (1913–1974): FG Senator 1969–1973
- Thomas Westropp Bennett (1867–1962): CnaG/FG Senator 1922–1936
- his brother George C. Bennett (1877–1963): CnaG/FG TD Limerick 1927–1948 and Senator 1948–1951
- Sir Edward Coey Bigger (1861–1942): Ind Senator 1925–1936
- his son Joseph Warwick Bigger (1891–1951): Ind Senator 1944–1951
- Neal Blaney (1893–1948): FF TD Donegal 1927–1937, Donegal East 1937–1938 and 1943–1948, FF Senator 1938–1943
- Neal's son Neil Blaney (1922–1995): FF/IFF TD Donegal East/Donegal North–East/Donegal 1948–1995, IFF MEP Connacht–Ulster 1979–1984, 1989–1994
- Neal's son Harry Blaney (born 1928): IFF TD Donegal North–East 1997–2002
- Harry's son Niall Blaney (born 1974): IFF/FF TD Donegal North–East 2002–2011
- Harry Boland (1887–1922): SF TD South Roscommon 1918–1922
- his brother Gerald Boland (1885–1973): FF TD/Senator Roscommon 1926–1961
- Gerald's son Kevin Boland (1917–2001): FF TD Dublin County 1957–1970
- his brother Gerald Boland (1885–1973): FF TD/Senator Roscommon 1926–1961
- Philip Brady (1898–1995): FF TD Dublin South–Central 1951–1977
- his son Gerard Brady (born 1936): FF TD Dublin Rathmines West/Dublin South–East 1977–1992
- Thomas Brennan (died 1953): FF TD Wicklow 1944–1954
- his son Paudge Brennan (1922–1998): FF TD Wicklow 1954–1973, 1981–1982, 1982–1987, Senator 1982
- Martin Brennan (1903–1956): FF TD Sligo 1938–1948
- his nephew Matt Brennan (born 1936): FF TD Sligo–Leitrim 1982–2002
- Robert Briscoe (1894–1969): FF TD Dublin South/Dublin South–West 1927–1965
- his son Ben Briscoe (born 1934): FF TD Dublin 1965–2002
- John Browne (born 1936): FG Senator 1983–1987, TD Carlow–Kilkenny 1989–2002
- his son Fergal Browne (born 1973): FG Senator 2002–2007
- Seán Browne (1916–1996): FF TD Wexford 1957–1961, 1969–1981, 1982
- his nephew John Browne (born 1948): FF TD Wexford 1982–
- Cathal Brugha (1874–1922): SF TD County Waterford 1918–1922
- his wife Caitlín Brugha (1879–1959): SF TD Waterford 1923–1927
- his son Ruairí Brugha (1917–2006): FF TD Dublin County South 1973–1977, Senator 1969–1973, 1977–1981, MEP 1977–1979
- Ruairí's father-in-law Terence MacSwiney (1879–1920): SF TD Cork Mid 1918–1920
- Terence's sister Mary MacSwiney (1872–1942): SF TD Cork Borough 1921–1927
- Terence's brother Seán MacSwiney: SF TD Cork Mid, North, South, South East and West 1921–1922
- Ruairí's father-in-law Terence MacSwiney (1879–1920): SF TD Cork Mid 1918–1920
- John Bruton (born 1947): FG TD Meath 1969–2004
- his brother Richard Bruton (born 1953): FG Senator 1981–1982, TD Dublin North–Central 1982–
- Patrick Burke (1904–1985): FF TD Dublin County/Dublin County North 1944–1973
- his son Ray Burke (born 1943): FF TD Dublin County North/Dublin North 1973–1997
- James Burke (died 1964): FG TD Roscommon 1951–1964
- his wife Joan Burke (born 1928): FG TD Roscommon 1964–1981
- John Butler (1891–1968): Lab TD Waterford–Tipperary East 1922–1923, Waterford 1923–1927, Senator 1938–1965
- his son Pierce Butler (1922–1999): FG Senator 1969–1983
- Alfred Byrne (1882–1956): IPP MP Dublin Harbour 1915–1918, Ind TD Dublin Mid/Dublin North 1922–1928, Ind Senator 1928–1931, Ind TD Dublin North/Dublin North–East 1932–1956
- his son Alfred P. Byrne (1913–1952): Ind TD Dublin North–West 1937–1944, 1948–1952
- his son Thomas Byrne (1917–1978): Ind TD Dublin North–West 1952–1961
- his son Patrick Byrne (born 1925): Ind TD Dublin North–East 1956–1957, FG TD Dublin North–East 1957–1969
Read more about this topic: Families In The Oireachtas