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• Yemen: Archontology
• Yemen: Glossary
• Yemen: Heads of Administration: 1941-1943
• Yemen: Heads of State: 1926-1962
• Yemen: Heads of State: 1962-1990
• Yemen: Heads of State: 1990-2019
• Yemen: Polity Style: 1926-2019
• Yemen: South Yemen: Archontology
• Yemen: South Yemen: Glossary
• Yemen: South Yemen: Heads of State: 1967-1990
• Yemen: South Yemen: Heads of State: 1994
• Yemen: South Yemen: Polity Style: 1967-1994
• YORK, duke of (Protector of England)
• Yugoslavia: Archontology
• Yugoslavia: Glossary
• Yugoslavia: Heads of State: 1918-1941
• Yugoslavia: Heads of State: 1943-1945
• Yugoslavia: Heads of State: 1945-1992
• Yugoslavia: Heads of State: 1992-2006
• Yugoslavia: Polity Style: 1918-2006
• Yugoslavia: Regents: 1918-1945
• Yugoslavia: Sources

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