IPTA can refer to:

• Indian People's Theatre Association
• International Pulsar Timing Array

• William Shaw (autism researcher)
• William Shaw (engineer)
• William Shaw (footballer)
• William Shaw Kerr
• William Shaw Mason
• William Shaw (Reverend)
• William Shaw (yacht designer)
• William Shaw (Yacht Designer)
• William Shayer
• William S. Hayward
• William Shearer (British Free Corps)
• Williams, Heather
• William S. Heckscher
• William Shedden Ralston
• William Sheffield (disambiguation)
• William S. Hein
• William S. Hein & Co.
• William Shelford (engineer)
• William Shell
• William Shellabear
• William Shelley (judge)
• William Shelley (justice of the common pleas)
• William Shelly
• William Shelly School and Annex
• William Shelton (college)