Ryōichi Sekiya (關家 良一, Sekiya Ryōichi, born 12 February 1967) is a Japanese ultramarathon and marathon runner from Sagamihara, Kanagawa.

He is the current Asian record holder of the 24-hour run with the distance of 274.884 km (170.805 miles), which he achieved in 2007 at Soochow International Ultra-Marathon.

[1] He is a four-time IAU 24 Hour World Championship winner, which makes him the athlete with the most wins in the event.

[6] Sekiya won the 153 miles (246 km) Spartathlon Ultra Race in Greece in 2002 and 2009.

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