The 2003 Bad Blood was a professional wrestling pay-per-view (PPV) event produced by World Wrestling Entertainment (WWE). It was the second Bad Blood and took place on June 15, 2003, at the Compaq Center in Houston, Texas. The event was held exclusively for wrestlers from the promotion's Raw brand division.

This was the first Bad Blood held since 1997, which had been produced as the 18th In Your House event. This 2003 event replaced the previously annual King of the Ring PPV and marked the beginning of worldwide pay-per-views (with the exception of the older and more significant Royal Rumble, WrestleMania, SummerSlam, and Survivor Series pay-per-views) being brand exclusive (the UK-exclusive pay-per-views had been brand exclusive since Insurrextion 2002).

The main event was a Hell in a Cell match, featuring wrestlers fighting in a ring surrounded by a steel structure. In this match, Triple H defeated Kevin Nash to retain the World Heavyweight Championship. Two predominant bouts were featured on the undercard; in respective singles matches, Ric Flair defeated Shawn Michaels and Goldberg defeated Chris Jericho.

The event marked the second time the Hell in a Cell format was used by WWE at a Bad Blood event; the first was at the inaugural Bad Blood in 1997. The 2003 Bad Blood event grossed over $500,000 ticket sales from an attendance of 10,000. This event helped WWE increase its yearly pay-per-view revenue by $6.2 million from the previous year. When the event was released on DVD, it reached a peak position of second on Billboard's DVD Sales Chart.