According to Official Guinness Records,
The longest nose on a living person measures 8.8 cm (3.46 in) from the bridge to the tip and belongs to Mehmet Özyürek (Turkey). It was measured on the set of Lo Show dei Record in Rome, Italy, on 18 March 2010.
For a complete list of 2010 records, please visit 2010 Guinness Records in Italy.