According to Official Guinness Records,
The largest violin is 4.27 m (14 ft) long, has a maximum width of 1.4 m (4.5 ft) and a bow with a length of 5.2 m (17 ft). It was made by the Vogtland masters of violin and bow making (Germany) in Markneukirchen, Germany, and completed on 14 June 2010.
Vogtland masters of violin and bow making consisted of 15 expert violin and bow makers from the region. The violin was an up-scaled replica of a violin made by Johannes Georg Shcönfelder II in the late eighteenth century. The length of the body measured over the arching was 2.52 m (8.27 ft), the belly stop was 1.37 m (4.4 ft), the neck stop was 0.91 m (2.9 ft) and the rib height was 0.22 m (10 in).
For a complete list of 2010 records, please visit 2010 Guinness Records in Germany.