Not to be confused with Thecla.
"So let's simplify. Let me repeat the first lesson I taught you. She's Issa and she doesn't get in the tub with men. But I'm Tekla, and I do, very much."
—Explaining her nature to Geralt

Tekla is one of the workers in Priestess Maerlina's baths, with duty to accompany customers into bath and clean them, introduced in The Witcher: Curse of Crows graphic novel. Unlike her colleague and friend, Issa, she is not only willing only to clean a male customers but also to have a physical type of love with them.