Stefan played in 37 tests for the Springboks, scoring 19 tries, including a South African test record of 4 tries (equalled with Chester Williams and Pieter Rossow) on debut against Ireland at Bloemfontein on June 13, 1998, which he later bettered by scoring a then record 5 tries against Italy on June 19, 1999.

Stefan started his career under the tutelage of Nick Mallet at the Boland Cavaliers (66 caps). He made his debut in 1999 for the Natal Sharks and played for the Ospreys in Wales. Stefan Terblanche has moved back to the Natal Sharks for the 2007 Currie Cup season in South Africa. He played his return game for the Durban-based franchise at Fullback and scored two tries and claimed man of the match in the Shark's 32-16 defeat over Western Province, the team who has won the Currie Cup title a record 32 times. This was also his 100th match played for the Sharks.

He is known as a great finisher—his test try per match ratio of 0.51 is among the highest in Springbok history and is significantly better than those of players like Carel du Plessis (0.33), Breyton Paulse (0.4) and Jean de Villiers (0.4), on par with current star Jaque Fourie (0.5) and old legend Pieter Rossouw (0.48) but short of Ray Mordt (0.66 or two tries in every three tests) and Danie Gerber's (0.79) incredible scoring records.

On October 3rd 2007 it was announced that Stefan had re-signed for the Natal Sharks on a one year contract.

Club:
National & International Representation
Craven Week: South Western District 1991-1993
Boland U23 1995
Boland (66 caps)
Natal Sharks 1999-2007 (101 caps) as at 17/07/2007
Ospreys 2003-2007 (87 apps) as at 03/10/2007
South Africa U21 1996
South African Barbarians 1996
South Africa 1998-2003 (37 caps)
British Barbarians 2000-2001

Other Achievements:
Holds Boland record for most tries in a season (20 in 1997)
Holds Boland record for career tries (49)
Equal top try scorer in 1998 Super 12 with 10 tries.
Member of Ospreys squad winning the 2006-07 Magners League