GPCA may refer to:

• Gulf Petrochemicals and Chemicals Association: A non-profit association serving all of its members with a variety of data, technical assistance and resources required by the petrochemicals and chemicals industry.
• Green Party of California: The California affiliate of the Green Party of the United States.

• Mashta Azar
• Mashta Deir Mama
• Mashta Elshalahmeh
• Mashtakan
• Mashta Mahfoz
• Mashta Mahfuz
• Mashtan
• M*A*S*H theme song
• Mashtik
• Mashti Mamdali's Car
• Mashtots
• Mashtots Avenue
• Mashtots Park Movement
• Mashtroy Kazan
• Mashtun
• MASH (TV series)
• MASH (TV show)
• Mashua
• Mashubi language
• Mashud Wisnusaputra Stadium
• Mashui
• Mashui (disambiguation)
• Ma Shuilong
• Ma Shui-Long
• Ma Shui-long