Santa Claus in a dream represents comfort and happiness because he may have a strong connection to your father.
Alternatively, Santa Claus may represent Christmas.
A Santa Claus who appears menacing in a dream indicates that you are feeling stressed preparing for a holiday.
To see someone dressed as Santa Claus in a dream applies the characteristics of Santa Claus to them. For example, to see your brother dressed as Santa Claus indicates that you believe he is a kind and generous person.