PLAA or Plaa can refer to:
People
Martin Plaa (1901 – 1978), a French tennis player Gabriel L. Plaa (1930 – 2009), an American-Canadian toxicologist
Other uses
Poor Law Amendment Act 1834, an 1834 UK law denying the right to feed the poor People's Liberation Army Army, the land forces of the People's Liberation Army in China Phospholipase A-2-activating protein, a human gene