Yellow flag

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Yellow flag may refer to:

  • Iris pseudacorus, an aquatic flowering plant
  • A flag of a yellow colour:
    • Yellow flag (contagion), historically displayed on ships to indicate the presence of disease or quarantine (obsolete); also used in some cities to mark a recent death in a neighborhood, regardless of cause
    • Racing flags, used in motor sports to indicate hazardous conditions
    • Penalty flag, used in various sports including American football
    • Yellow Flag Line, transport on the Chao Phraya River, with service indicated by the flag color
    • Yellow Dragon Flag, the flag of the Qing dynasty
  • The Yellow Flag, 1937 German drama film