Oliver Langford from the West Midlands.
Oliver has reffed one Millers game this season, which was the Friday night 1-0 defeat at Cheltenham just before the New Year. Marlon Pack give the home side the three points with an early strike as four players saw yellow that evening.
Prior to that, Langford was last in charge of the Millers last April, when a late Andy Barcham goal saw Gillingham take the three points home from Don Valley in a 1-0 victory.
Langford's stats this season so far stand at 31 matches in the middle, with a heavy 83 yellows and 8 red cards issued.
Running the lines at the Kassam Stadium are Mr. D. Woolford (Hampshire) and Mr. G. Evetts (Hertfordshire).
The fourth official is Mr. R. Whitton (Essex).