Martín Madrazo is a character in the Grand Theft Auto series who appears as a supporting character in Grand Theft Auto V and a main character in Grand Theft Auto Online.

The head of his own Mexican-American drug Cartel, Madrazo is a powerful and wealthy legitimate businessman settled in Los Santos with his wife, Patricia. During the events of Grand Theft Auto V, he forcefully hires co-protagonist Michael De Santa following an incident that cost him millions of dollars.

A while later, Madrazo calls Michael for a job, driving to his ranch in Vinewood Hills. Also with Michael was Trevor Philips, who had a crush on Patricia. Madrazo told them that he needed his cousin Javier killed because he was thinking of testifying against Madrazo, so he set up a turret in the hills, which would be used to shoot Javier's private plane down.

Afterwards, Trevor returned to Madrazo's home with some sensitive files retrieved from the plane wreckage, and when Madrazo refused to pay him, he first cut Madrazo's ear off, before stealing his wife and car, then driving off to his trailer, where he and Michael hid for a short time.

In order to prevent Madrazo from killing him and Trevor, Michael retrieved an Aztec fertility statue from a sunken container and gave it to him as a peace offering (knowing that Madrazo was fond of such artifacts, having seen several of them in his house). Madrazo's wife is returned to him, but Trevor threatens to kill him if he ever mistreats her again, so after this point, Madrazo is not heard from again. However his wife will make two phone calls to Trevor, each time speaking to him only briefly before saying she has to go because Madrazo is coming.