W2, W-2, or w2 may refer to:
W2 (tram), a class of electric trams built by the Melbourne & Metropolitan Tramways Board W2, one of four manuscripts of the Magnus Liber W2, a postcode district in the W postcode area of the United Kingdom w2 Concertzaal, a pop stage in 's-Hertogenbosch, The Netherlands W-2 tool steel, a water-hardening variety of high carbon steel Apple W2, a wireless chip used in the Apple Watch Series 3 Arado W 2, a two-seat twin-engine seaplane trainer British NVC community W2, a Woodland and scrub community in the British National Vegetation Classification system Form W-2, a United States federal tax form issued by employers and stating how much an employee was paid in a year The Vector W2, a concept car Wisconsin Works, a workforce development and welfare replacement program in Wisconsin (a form of Workfare) Perfect World (video game), also known as PW and World2, 3D MMORPG game Sri Lanka Railways W2, diesel-hydraulic locomotives Webster's New International Dictionary, Second Edition Third step of the W0-W6 scale for the classification of meteorites by weathering Windows 2.0x, a Microsoft operating system
See also 2W (disambiguation) W3 (disambiguation)