Per-Olof "Posa" Serenius (born 9 March 1948) in Hedemora, Sweden, is a Swedish former ice speedway rider. He is notable for winning two World Individual Championship gold medals in ice speedway.

Biography Serenius was a fireman by profession. Already an experienced motorcyclist, he began to compete in ice speedway racing in 1976 after witnessing a World Championship ice speedway competition in Berlin. His career racing record includes two World Individual Championship gold medals, three World Team gold medals, 32 World finals, 22 national championships and eight Nordic Championships. He participated in the documentary film Icy Riders from 2008. In 2016, Serenius was named an FIM Legend for his motorcycle racing achievements.

World final appearances Ice World Championship 1978 Assen, 13th 1979 Inzell, 8th 1980 Kalinin, 15th 1981 Assen, 13th 1982 Inzell, 2nd 1983 Eindhoven, 9th 1984 Moscow, 10th 1985 Assen, 10th 1986 Stockholm, 7th 1987 Berlin, 11th 1988 Eindhoven, 8th 1989 Almaty, 6th 1990 Gothenburg, 4th 1991 Assen, 2nd 1992 Frankfurt, 5th 1993 Saransk, 6th 1994 10 Rounds GP, 2nd 1995 10 Rounds GP, Champion 1996 10 Rounds GP, 6th 1997 Assen, 6th 1998 10 Rounds GP, 5th 1999 10 Rounds GP, 10th 2000 Assen, 11th 2001 8 Rounds GP, 11th 2002 8 Rounds GP, Champion 2003 6 Rounds GP, 9th 2004 8 Rounds GP, 9th 2005 6 Rounds GP, 11th 2006 4 Rounds GP, 12th 2007 6 Rounds GP, 17th 2008 6 Rounds GP, 10th

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