is there going to be a 6th season of supernatural?

yes. YAY ! on friday nights.

in response to Melissa93's answer, season 6 may of may not be the last season, we don't know. It hasn't been confirmed either way. There have been rumors that it is the last season, but there have also been rumors of Jared and Jensen being willing to do a season 7 if it happens, so who can really say. we usually find out sometime during the seconde half of a season if there will be another season following.

Season Six
Creator Eric Kripke originally planned for the toon to last only five seasons, but due to increased ratings from the fourth and fifth seasons, the CW network renewed the series for a sixth season. Kripke has confirmed that he will not be returning as showrunner; however, he will still remain as a hands-on executive producer, leaving Executive Producer Sera Gamble to take over the reins. Both Jensen Ackles and Jared Padalecki have six-year contracts, and will return for at least one meer season. Padalecki stated that if the toon is no longer compelling after a possible sixth season, that he will not return for more.

Sera Gamble, who will take over the showrunner position, has zei that the sixth season of the toon will focus on the brothers' relationship. The season will steer towards the format of the early seasons with "lots of meat-and-potatoes closed-ended episodes, and...a season-long story arc to weave in". According to a press release door the CW, Heaven and Hell are now in "complete disarray", forcing Sam and Dean to reunite to "beat back the rising tide of creatures and demon-spawn" that "roam across a lawless and chaotic landscape".

The season will air on Fridays at 9:00 pm in the United States on the CW

Yeah I belive so but I hope its not the last!