An Australian Federal Police officer accused of having a sexual relationship with a child will fight multiple criminal charges against him.

The 35-year-old man, who was suspended from duty last month, did not appear in the ACT Magistrates Court today.

His lawyer, Bridie Harders, entered pleas of not guilty on her client's behalf to 21 charges, including grooming, acts of indecency and maintaining a sexual relationship with a young person.

An application to have the officer's name supressed was granted by Magistrate Louise Taylor over concerns it may identify the young person.

In court, prosecutors did not oppose the suppression order, but indicated they would like it to be re-examined at the next hearing.

The police officer, from Palmerston in Canberra's north, is due back in court in September.

In a statement, police said that "all AFP members are expected to behave at all times in a manner that upholds the organisation's core values, reputation and integrity — consistent with community expectations.

"As this matter is before court it would not be appropriate to make any further comment."