In its original American broadcast in HBO, "Mhysa" was seen by an estimated 5.4 million household viewers, according to Nielsen Media Research. It marked a year-to-year increase in viewership of 28 percent compared to the second season finale, "Valar Morghulis", which was seen by 4.2 million. The second broadcast of the "Mhysa" during the night was viewed by 900,000 viewers, bringing its total viewership for to 6.30 million. According to analysts, the success of the episode significantly helped Game of Thrones to surpass True Blood as the second most-watched series on HBO, after The Sopranos. In the United Kingdom, the episode was viewed by 1.154 million viewers, making it the highest-rated broadcast that week. It also received 0.110 million timeshift viewers.
