Marshall Law (マーシャル・ロウ Māsharu Rou?) is an American fighter of Chinese descent who was introduced in the original Tekken game, and has returned for all subsequent Tekken games, except Tekken 3 and Tekken Tag Tournament (where he was replaced by his son, Forest Law, though he made a cameo in his son's ending and in the opening in the former). He is a very close friend of Paul Phoenix and is married to Mrs. Law.

Preoccupied with paying off his son's debts, Marshall Law didn't realize how many of his students had quit his dojo until it was almost too late. With a large sum still to repay, Law was running out of ideas. As a last resort, he decided to search for a capable fighter to run the dojo. He asked his friend Paul if he knew anyone, and in his usual manner, Paul said he himself would be the perfect candidate.

However, thinking that the dojo would go bust in half a day if Paul took control, Law politely refused. Instead, he put the word out that if any strong fighters wanted to try out for the job, they should come and prove their skills in combat. Challenger after challenger appeared, but none of them were good enough for Law. Then, one day, Law heard a rumor that a martial artist living in rural China was set to be the next God Fist master. Seeing this as his best chance yet, Law set off for his ancestral homeland. Ending Description: While fighting Feng Wei, Law is knocked far away but is saved by Paul from behind.

Despite Feng's amazing power and skill, the duo ultimately achieve victory. They high five each other and leave the arena. But suddenly, Feng gets up with an overwhelming aura surrounding him. Terrified after seeing how dangerous Feng is, Paul and Law ran away.