The Lions victory means both Mumbai Indians and Chennai Super Kings are out of the tournament, and later today's IPL derby between the two sides have now been reduced to a dead rubber.
The Lions, with three wins from four games, have now joined Sydney Sixers as the other team from Group B in the semi-finals.
Both the teams have 12 points in their kitty.
A victory for Yorkshire against Lions today could have opened up the group, but now Mumbai and Chennai have become the third IPL team after reigning IPL champions Kolkata Knight Riders to crash out of the event.
Against Yorkshire everything went according to the script for the home team.
Opting to ball, the Lions first restricted Yorkshire to a modest 131 for seven and then chased down the target, reaching 134 for five, with four balls to spare.
Young Quinton de Cock top-scored for the Lions with 32 that came off 35 balls with the help of two fours and as many sixes.
Even though the Lions panicked a little bit towards the end, Jean Symes (27 not out off 22) and Dwaine Pretorious (25 off 14) played useful cameos to take side home. MORE