Rotherham make it eight summer signings
The 20-year-old midfielder has impressed in two pre-season games against Parkgate and Stocksbridge Park Steel, finding the net in both fixtures.
He now links up with the Millers' squad and joins Lewis Buxton, Danny Collins, Joe Mattock, Aidy White, Emmanuel Ledesma, Greg Halford and Tom Thorpe as manager Steve Evans' other new recruits.
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Hide AdWard spent time on loan with League One outfit Coventry City last season making 11 appearences at the Ricoh Arena.
Boss Evans told the Millers website: "Everyone inside the football club, none more so than the players, will be delighted to hear the news that we have now completed the signing of Grant Ward from Tottenham Hotspur.