Andrea Bradley will take up the main function on the Educational Institute of Scotland (EIS) in the summertime.
She succeeds Larry Flanagan, who has been in put up for 10 years and introduced earlier this yr he could be standing down.
Ms Bradley was appointed following a gathering of the EIS council on Friday.
She presently serves because the union’s assistant normal secretary and has been in that put up for the final seven years.
She was beforehand a principal instructor of English at South Lanarkshire Council.
Ms Bradley mentioned she doesn’t “under-estimate” the challenges the put up will current, with the union just lately threatening strike motion over a 2% pay supply.
She added: “I am honoured to be chosen as the next general secretary of the EIS, and I look forward to assuming my post in the near future.
I do not under-estimate the challenges that the post of general secretary will present, but I intend to face these head-on.
“In the immediate term, securing a fair pay settlement for Scotland’s teaching professionals will be the top priority for the EIS and I will do all that I can towards achieving this objective.”
Heather Hughes, EIS president, mentioned: “Andrea brings vast experience of Scottish education, and a strong commitment to trade unionism, to the role.
“Scotland’s teachers could not hope for a better appointment, and I look forward to working with Andrea to promote the interests of Scottish education and Scotland’s teaching professionals.”