W1
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W1 could refer to:
- The London postal district W1
- W1, Salix cinerea - Galium palustre woodland, one of the woodland communities of the British National Vegetation Classification
- One of four manuscripts containing the Magnus liber, or Magnus liber organi. The term is derived from the Wolfenbüttel library which holds the manuscript. The other sources are W2, F1 (Florence), and Ma (Madrid).