In Irish mythology, Deichtine or Deichtire was the sister of Conchobar mac Nessa and the mother of Cú Chulainn.
Her husband was Sualtam, but Cú Chulainn's real father may have been Lugh of the Tuatha Dé Danann.
When a flock of birds descended on Emain Macha and ate all the grass, the Ulstermen decided to hunt them, and they set off after them in their chariots.
While the Ulstermen whispered that it was actually Conchobar's son, the latter betrothed Deichtine to Sualtam mac Roich, who owed him a great favor.
Although Conall the Victorious was a bitter enemy of Anluan and Cet mac Maga, they were his maternal uncles.