Katriina Isberg was born in Toronto, Ontario with an Estonian background and speaks both English and Estonian. Her parents are Valve Leemet Isberg and Ulo Isberg, and her sister is Aleksandra Isberg.Acting was something Katriina dreamed about doing as a kid, but was talked out of by others who told her it was an "unrealistic dream". She kept it close by at the back of her mind, though, as she attended both Claude Watson School For The Arts and Earl Haig Secondary School in The Claude Watson Arts program as a dance major. Aside from majoring in dance, Katriina took part in various choirs, numerous art shows, a few school plays, and did a bit of modeling as well. She was also part of Team Canada for Group Aesthetic Rhythmic Gymnastics at Kalev Estienne from 2003-2008, competing around the world.But it wasn't until she attended The University of Western Ontario, leaving all of the performing arts behind, where she realized how much of a passion she had for it. She left university after one year, but stayed in London, Ontario for another year just working and figuring things out. It was within that year where she finally decided to follow her childhood dreams and pursue acting as a career.After moving back to Toronto in 2010, Katriina started taking acting classes and workshops at various studios and signed with a top Toronto agency in 2011. From there, her acting career began.