The Football League revealed the final shortlists ahead of their annual awards ceremony on Sunday at The Brewery in London.
The nominees were voted for by the managers of their respective divisions.
Winger Ritchie, who took home the League Two Player of the Award last season, scored nine times for Swindon before making a move to the south coast with the Cherries in January.
Clarke, who started the season at Charlton, has found the net 21 times in total this term - 11 of those coming during a loan spell at Scunthorpe over the first half of the campaign before the Sky Blues snapped him up from the Addicks in January.
The 28-year-old striker has since gone on to find the net a further 10 times for City before a recurring ankle problem cut short his season earlier this month.
Midfielder Judge, 24, has been a consistent performer in something of a stop-start season for the Magpies, who still harbour hopes of forcing their way into the play-off positions.