As of 2018, who holds the worlds official land speed record?

The official land speed record is held by a member of the Royal Air Force, Andy Green. On October 15, 1997 in Black Rock Desert, Nevada he maneuvered a vehicle with twin Rolls Royce jet engines to a speed of 763 MPH.

Green is the current holder of the World Land speed record, and the first person to break the sound barrier on land. On 25 September 1997 in Thrust SSC he beat the previous record in Black Rock Desert, USA, reaching a speed of 714.144 miles per hour (1,149.303 km/h). On October 15, 1997, 50 years and 1 day after the sound barrier was broken in aerial flight by Chuck Yeager, Green reached 763.035 miles per hour (1,227.986 km/h), the first supersonic record (Mach 1.016). His call sign was "Dead Dog".

Green is now working with Richard Noble again on their new record attempt to break the 1,000 miles per hour (1,600 km/h) mark with Bloodhound SSC.