Nelson Police are looking for 41-year-old Karl Robertson.
Mr Robertson has not been heard from since yesterday morning and this is out of character for him.
Mr Robertson has Autism and Asperger’s syndrome and Police have concerns for his welfare.
Mr Robertson is of medium build and approximately 175 cm tall.
It is believed he may be in the Richmond or Stoke area.
Anyone who may have seen Mr Robertson or know where is asked to call 111.