As part of the worldwide campaign, millions of people took to the streets to demand action to combat greenhouse gas emissions and environmental destruction, and several celebrities joining the fray.
Billie Eilish voiced her support by posting an Instagram video of her dancing in an outfit with the words TICK TOCK emblazoned across it.
She captioned the video: "TICK TOCK! our time is running out. the climate crisis is very real. we need to speak up and demand that our leaders take action."
The Bad Guy singer also tagged Swedish schoolgirl Greta Thunberg, whose original school strike last year sparked a string of similar protests, in the post.
Lizzo meanwhile, posted a picture of a protest placard that referenced the lyrics to her hit Truth Hurts that read: "I just took a DNA test turns out I'm 100% freaking terrified for our future."
Shawn Mendes, The 1975 - who have recorded a song with Greta - and John Legend also voiced their support for the movement, with the All of Me hitmaker writing on Twitter: "Young activists are challenging us to confront the realities of the climate crisis.
"Join me as I stand with @amnestyusa and @GretaThunberg today as we strike for climate," he added, with a link to the protest's official website.