Communications Minister Mitch Fifield has made another complaint to the ABC - the sixth in five months - this time about commentary on the controversial date of the "super Saturday" byelections.

Senator Fifield has taken issue with the characterisation of the decision to hold five byelections on July 28 - the weekend Labor had booked its national conference - as a deliberately political move.

"The Prime Minister did not decide the date for the byelections," Senator Fifield told ABC boss Michelle Guthrie in a written complaint obtained by Fairfax Media.

ABC Managing Director Michelle Guthrie and Minister for Communications Mitch Fifield. Credit:Alex Ellinghausen

"It is totally unacceptable for the national broadcaster to report this Labor lie as fact."