UFC on Fox: Johnson vs. Moraga (also known as UFC on Fox 8) was a mixed martial arts event held on July 27, 2013 at the Key Arena in Seattle, Washington. The event was broadcast live on FX and Fox.

The main event was a UFC Flyweight Championship bout between champion Demetrious Johnson and top contender John Moraga. The pairing was originally expected to take place on April 13, 2013 at The Ultimate Fighter 17 Finale. However, Johnson was forced out of the bout with an injury and Moraga was pulled from that event as well.

Michael Chiesa was originally set to face Reza Madadi on this card. However, on May 14, 2013, it was announced Madadi pulled out of the bout citing alleged visa issues and was replaced by Jorge Masvidal.

Miesha Tate was pulled from her scheduled bout with Liz Carmouche to participate as coach on The Ultimate Fighter 18 and was replaced by Jessica Andrade.

Tarec Saffiedine was expected to make his promotional debut at this event opposite Robbie Lawler; however, Saffiedine was forced out of the bout with an injury and was replaced by Siyar Bahadurzada. On July 11, it was announced that Bahadurzada also pulled out of the bout and was replaced by Bobby Voelker.

Matt Mitrione was expected to face Brendan Schaub at the event. However, in mid-July, Mitrione pulled out of the bout citing an injury and Schaub was pulled from the event as well with the pairing rescheduled to UFC 165.

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