Guðmundur Sigurjónsson (born 25 September 1947) is an Icelandic chess grandmaster.

He was the 2nd Icelandic player to get the grandmaster title after Friðrik Ólafsson.

He won the Icelandic Chess Championship three times (1965, 1968 and 1972).

[2] His tournament successes included 1st at Reykjavík 1970, =1st at Sant Feliu de Guíxols 1974, =2nd at Hastings 1974–75, =1st at Ourense 1976, =2nd at Cienfuegos 1976 and =1st at Brighton 1982.

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