Siobhan McSweeney, Anne-Marie Duff, Lisa McGee and Sharon Horgan have all won Bafta TV awards at the annual ceremony in London.
McSweeney and Duff won for their respective roles in Derry Girls and Bad Sisters, while McGee and Horgan won for their creative endeavours on those shows.
While collecting the Bafta TV award for best scripted comedy, Derry Girls creator Lisa McGee thanked Channel 4, asking it to "please never change" and thanking "our first home, Derry".
Sharon Horgan picked up a Bafta for her show Bad Sisters, which won the TV award for best drama series. During her acceptance speech she said she stands in "solidarity" with the US writers' strike.
Horgan also said the show was a "really difficult shoot" but praised the "brilliant" cast during her speech.
"It all begins and ends with the writers so we are in solidarity with our WGA brothers and sisters," she said.
First winner on the night was 43-year-old Siobhan McSweeney, who plays Sister Michael, the eye-rolling principal of the show's Our Lady Immaculate College in the Channel 4 hit Derry Girls.
The comedy about a group of teenagers growing up in Derry in the 1990s was a hit that built a large and committed following across its three seasons.
Set during the Troubles, the show was praised for offering a new perspective on the period of the IRA and loyalist ceasefires through the eyes of a group of young girls.
In the humorous speech, which she said in double speed given the short time given, she said: "So I’ve been warned not to do a political statement, so as my mother laid dying in Cork, one of the very last things she said to me was would I not consider retraining as a teacher.
"If she could see me now, getting a Bafta for playing a teacher. Joke’s on you."
McSweeney also paid tribute to the Foyleside population, saying: "To the people in Derry, thank you taking me into your hearts and your living rooms.
"I am daily impressed with how you encompass the spirit of compromise and resilience despite the indignities, ignorance and stupidity of your so-called leaders (in) Dublin, Stormont and Westminster.
"In the words of my beloved Sister Michael, 'it's time they started to wise up’."
She also thanked Derry Girls writer Lisa McGee "for not listening to me when I said I could play all the girls parts" and she also thanked Channel 4, adding "you have my devotion".
Meanwhile, Anne-Marie Duff - who won the supporting actress award at the Baftas for Bad Sisters - said she was "completely shocked" and thanked the cast and production team.
She added that TV is a "political arena" and said she had a message to people at home.
Duff said: "If someone is in their life who is bullying them who is telling them that who they are is wrong, that what they are isn't enough . . . I am telling you now you are everything."
Source: Press Association
