The meaning of the Acronym OIW is...

OIW is

• Oil-in-Water

More Meanings For OIW:

• Oregon Iron Works, Inc.
• Oil-in-Water
• Operations/ Intelligence Workstation
• Our Indian Wards (by George W. Manypenny, published in 1880)

OIW is also in:

• Environmental
• Firms
• Media
• Military