| Title | Category | Subcategory | Records |
|---|---|---|---|
| Blairs Cyclopaedia Of Australasia | Newspapers, Directories & Social History | Social History | 809 |
| Book Of Deeds Of Manumissions Of Slaves, 1774-1792 (Kent, Pennsylvania) | Institutions & Organisations | Courts & Legal | 848 |
| Boston Births and Baptisms, 1630-1699 | Life Events (BMDs) | Civil Births | 11,979 |
| Boston Births, 1630-1849 | Life Events (BMDs) | Civil Births | 4,368 |
| Boston Deaths, 1630-1825 | Life Events (BMDs) | Civil Deaths & Burials | 85,394 |
| Boston Passenger Lists 1846-1851 | Travel & Migration | Passenger Lists | 90,262 |
| Boston Pilot Newspaper Information Wanted Ads | Travel & Migration | Migration | 41,249 |
| Boyd's Inhabitants Of London & Family Units 1200-1946 | Census, Land & Surveys | Surveys | 583,158 |
| Boyd's London Burials | Life Events (BMDs) | Parish Burials | 242,635 |
| Bradford Pals 1914-1918 | Armed Forces & Conflict | First World War | 1,554 |
| Brandon, Manitoba, Canada, Estate Index, 1884-1984 | Life Events (BMDs) | Wills & Probate | 29,790 |
| Brands Directory South Australia | Education & Work | Farming & Agriculture | 346 |
| Brands Directory South Australia Sheep | Education & Work | Farming & Agriculture | 315 |
| Breconshire Baptisms | Life Events (BMDs) | Parish Baptisms | 114,353 |
| Breconshire Burials | Life Events (BMDs) | Parish Burials | 125,592 |
| Breconshire Marriages and Banns | Life Events (BMDs) | Parish Marriages | 122,682 |
| Brief History Of Canberra | Newspapers, Directories & Social History | Social History | 261 |
| Brisbane Hospital Patient Index, 1887-1902 | Institutions & Organisations | Hospitals | 2,074 |
| Britain School & University Memorial Rolls 1914-1918 | Armed Forces & Conflict | First World War | 58,520 |
| Britain, Absent Voters Lists 1918-1921 | Census, Land & Surveys | Electoral Rolls | 20,812 |