Liesbeth Simone Vosmaer-de Bruin (née de Bruin, born 9 January 1946) is a retired Dutch rower.

She competed at the 1976 Summer Olympics in the coxed fours, together with Hette Borrias, Myriam van Rooyen-Steenman, Ans Gravesteijn and Monique Pronk, and finished in fifth place.

[1] She won a European title in this event in 1973, with Hette Borrias, Myriam van Rooyen-Steenman, Yvonne Vischschraper and Liesbeth Pascal-de Graaff.

[2] At the world championships, her team was fifth in 1975 and seventh in 1977 and 1978.

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