Yes, the Celts were before the Vikings. The Celtic culture flourished in Europe during the Iron Age and Medieval periods, roughly from around 1200 BCE to the 1st century CE. The Celts were known for their rich culture, art, and warrior traditions, and they inhabited areas that are now part of modern-day Ireland, Scotland, Wales, and parts of continental Europe.
On the other hand, the Viking Age began much later, around the late 8th century CE (793 CE is often cited as the start of the Viking Age) and lasted until the 11th century. The Vikings, originating from what is now Denmark, Norway, and Sweden, were seafaring warriors and traders who raided and settled in various parts of Europe, including the British Isles.
In summary, the Celts predate the Vikings by several centuries. The Celtic civilization was already well-established by the time the Viking Age began.