The forward was in excellent form for the Whites during the month.
The 24-year-old scored four times in eight games during the month including a brace in the 3-2 victory over Reading and the opener in the 2-2 draw with promotion-chasing Hull City.
His form is perhaps more impressive as he had played only two games before the start of the month since the end of January due to injury, and with his previous goal coming all the way back in December, the hot streak would have helped the New Zealand international remind United supporters what he is capable of.
Halford was hugely influential in helping Rotherham guarantee their survival, and scored the winner when the Millers came up against Leeds in their first game of the month.
Meanwhile, Forestieri scored twice during the month to help the Owls secure their spot in the Championship play-off spots.