Semi-Final 1 of Robot Wars: The Fourth Wars was the first of two semi-finals which determined the Grand Finalists of Robot Wars: The Fourth Wars, out of eight semi-finalists. The eight robots were paired off in Round 1, with the four victors pairing off in Round 2 to determine two Grand Finalists. The episode featuring Semi-Final 1 was originally broadcast on February 2, 2001 on BBC Two.