MDY may refer to:

• MDY, month–day–year format for writing out dates
• MDY, IATA airport code for Henderson Field (Midway Atoll)
• MDY Industries, creator of the Glider bot software
• MDY, NYSE Arca ticker symbol for MidCap 400 SPDR, an American exchange-traded fund

This disambiguation page lists articles associated with the title MDY.
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