Blue Knot Day is an Australian national day on which Blue Knot Foundation calls on all Australians to unite in support of the more than 5 million Australian adults who have experienced complex trauma.

Complex trauma includes lots of different often damaging experiences. It also refers to the effects of those experiences. The experiences can occur at any age – in childhood, as a young person, in adulthood and into old age. Examples include violence, abuse, neglect and exploitation or growing up without a person who is able to care for, understand and protect you. Many people experience them repeatedly or over time. The good news is that people can and do recover from the impacts of complex trauma. Many people also develop remarkable resilience and grow beyond their trauma experiences.

Blue Knot Day is held every year on the last Thursday in October.