The media regulator is investigating three incidents, which have attracted a total of 1,225 complaints, to see they breach the UK broadcasting code.
The incident that prompted the most complaints from viewers, a total of 1,108, involved housemate Conor McIntyre being abusive to Miss India UK title holder Deana Uppal.
McIntyre was warned about his behaviour by Big Brother, in which he used a string of expletives and called her a piece of shit. The incident occurred at 9.40pm on 25 June
The second incident involved housemate Caroline Wharram calling Adam Kelly, a black contestant, a “ridiculous gorilla … with no sanitation”.
Ofcom received 114 complaints from viewers about the perceived racial slur, which occurred on 28 June at 10.25pm.