Siniva Marsters (born 7 October 1980)^[1] is a former Cook Islander female athlete who competed in discus throw, hammer throw and shot put.

Marsters was educated at Tereora College, and subsequently trained in New Zealand, Australia, and Europe.^[2] She first represented the Cook Islands internationally at the Coca Cola Games in Fiji in 1994.^[2] Since 2000 she has worked for the Cook Islands Sports and National Olympic Committee.^[2] In 2018 she became acting secretary-general following the dismissal of Robert Graham.^[3][4] In 2019 she moved to Suva, Fiji for a position with the Oceania National Olympic Committees.^[2]

Achievements

Year	Competition	Venue	Position	Event	Notes
Representing  Cook Islands
1997	World Championships	Athens, Greece	26th	Discus throw	35.22 m
2000	Oceania Championships	Adelaide, Australia		Shot put	10.74 m
2002	Commonwealth Games	Manchester, United Kingdom	20th	Hammer throw	40.40 m
2003	World Championships	Stade de France, Paris	40th	Hammer throw	41.54 m
2004	Oceania Championships	Townsville, Australia		Hammer throw	41.53 m
2006	Oceania Championships	Apia, Samoa		Hammer throw	41.51 m