4/1 may refer to:

• April 1 (month-day date notation)
• January 4 (day-month date notation)

• Achanak (disambiguation)
• Achanakmar Wildlife Sanctuary
• Achanalli
• Achanalt station
• Achanalt train station
• Achanan
• Achan (Bible)
• Achan (Biblical figure)
• A Chance of Snow
• A Chance To Live
• A Chance to Live
• A Chance to Love
• Achan Chak
• Achan (disambiguation)
• Achandran
• A. Chandrasekaran
• Achang
• A Change for the Better
• A Change in Me (Beauty and the Beast)
• A Change is Gonna Come
• A Change Is Gonna Come (Grey's Anatomy)
• A Change of Climate
• A Change of Scenery
• A Change Of Scenery (album)
• A Change of Seasons (album)