Theo is the stage name used by Swedish singer Theodor Haraldsson, who is also known as Theoz. He is from Linköping in Sweden and is active as a singer, dancer, TikToker and actor.

He is associated with pop music. Outside music, he builds a profile through social media, where he posts dance and lip-sync videos on TikTok under the name theozofficial and has built a large following. He is also nominated for Sweden's Big Buzz Awards in the Rising Star category.