James Callaghan
| James Callaghan | |
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| Pennmenyster an Ruwvaneth Unys | |
| Sodhans
4 Ebryl 1976 - 28 Me 1979 | |
| Myghtern(es) | Elizabeth II |
| Parti | Lavur |
| Bleynys gans | Harold Wilson |
| Sewys gans | Margaret Thatcher |
Leonard James "Jim" Callaghan, Baron Callaghan a Gardydh, KG, PC (27 mis Meurth 1912 – 26 mis Meurth 2005) o pennmenyster Ruwvaneth Unys.