Manuel Rivera may refer to:

• Manuel Rivera, Jr. (1960–1991), United States Marine Corps officer
• Manuel Rivera Garrido (born 1978), Peruvian football player
• Manuel Rivera-Ortiz (born 1968), Puerto Rican photographer

• Siege of Kolobrzeg (1807)
• Siege of Koriyama (1544)
• Siege of Koriyama Castle (1544)
• Siege of Kotte (1557-1558)
• Siege of Kotte (1557–1558)
• Siege of Kotte (1557–58)
• Siege of Kołobrzeg
• Siege of Kołobrzeg (1807)
• Siege of Kołobrzeg (Seven Years' War)
• Siege of Krakow
• Siege of Krakow (1587)
• Siege of Krakow (1657)
• Siege of Kraków (1587)
• Siege of Kraków (1657)
• Siege of Kruje (1450)
• Siege of Kruje (1466)
• Siege of Kruje (1466–1467)
• Siege of Kruje (1466–67)
• Siege of Kruje (1467)
• Siege of Kruje (1478)
• Siege of Krujë (1466)
• Siege of Kurokawa
• Siege of Kusong
• Siege of Kōriyama (1544)
• Siege of Kōriyama Castle (1544)