Strikeforce: Diaz vs. Cyborg was a mixed martial arts event that was held by Strikeforce on January 29, 2011 at the HP Pavilion in San Jose, California, United States.

A welterweight bout between Nate Coy and Nate Moore, which was originally scheduled to take place at ShoMMA 13, took place at this event.

Six of the preliminary card fights were streamed live on Sherdog.com.

This was the last Strikeforce event to feature amateur bouts, which were removed from all future Strikeforce cards following the promotion's sale to Zuffa, LLC in March 2011.

Strikeforce Challengers color commentator Pat Miletich filled in for the absent Gus Johnson on the live broadcast of this card.

The event drew an estimated 561,000 viewers, with a peak at 850,000 on Showtime.

Champ Nick Diaz: $150,000 (no win bonus) def. Evangelista "Cyborg" Santos: $20,000

Champ Ronaldo "Jacare" Souza: $85,000 ($15,000 win bonus) def. Robbie Lawler : $65,000