Esaias (Henrik Wilhelm) Tegnér Jr. (Swedish: [tɛŋˈneːr]; 13 January 1843, Källstorp, Malmöhus County – 21 November 1928, Lund) was a Swedish linguist. He was professor of eastern languages at Lund University 1879-1908, lead editor of Svenska Akademiens ordbok 1913-1919, member of the Bible Commission (writing a new translation) 1884-1917, and member of the Swedish Academy from 1882 onward. Tegnér was the grandson of the well-known poet Esaias Tegnér, also his namesake, and was brother-in-law to the poet and composer Alice Tegnér.
Esaias Tegnér's parents were Kristofer Tegnér, a provost and vicar, and Emma Sofia Tegnér (née Kinberg). He began studying at Lund in 1859, graduated with a PhD in 1865, and became a Docent in Semitic languages the same year. In 1872 he became an adjunct professor in comparative linguistics. He further studied linguistics in Stockholm beginning 1873, and joined the Scientific Society of Uppsala in 1876.
In 1879 Tegnér married Märta Maria Katarina (née Ehrenborg) who was herself born in 1859 in Linde, Gotland County. The same year he joined the Royal Swedish Academy of Letters, History and Antiquities. He also became a member of the Royal Society of Sciences and Letters in Gothenburg in 1882, doctor of theology at Copenhagen in 1894, and a member of the Royal Swedish Academy of Sciences in 1896.