Jansma is a surname of Dutch origin. People with that surname include:
nl:Bintje Jansma (1888–1976), Dutch agriculturalist from Sumar, Netherlands after whom the potato cultivar Bintje is namedDanica Jansma (born before 2012), American winner of the beauty pageant Miss Montana Teen USA in 2012Derek Jansma (born before 2011)), American Harvard Crimson men's volleyball playernl:Jan Jansma (born 9 August 1962), Dutch international bridge playerKristopher Jansma, American writer and novelistRik Jansma (born before 2006), Dutch chef, co-founder of the restaurant Basiliek in Harderwijk, NetherlandsSijtse Jansma (1898–1977), Dutch tug of war competitor who competed in the 1920 Summer OlympicsSybren Jansma (born 1982), Dutch bobsledder who has competed in the Winter OlympicsTimothy J. Jansma (active from 1977), American luthier