The 51-year-old suspect was arrested Wednesday and charged with three counts of invitation to sexual touching and one each of sexual assault, incest and sexual interference.
The father’s name can’t be released to protect his daughter’s identity.
Lethbridge police allege the girl was assaulted multiple times between June 2012 and earlier this month.
They also allege that the child’s friends, who are seven- and nine-year-old girls, were assaulted a number of times last summer
The man was arrested on Wednesday and will remain in custody pending a court appearance on Jan. 31.