Fidler was a regular starter for Albion last term after signing from Jersey.
The former Cambridge and Newbury forward is one of 13 players who have so far announced they are leaving Brickfields following their relegation from the Championship, although others are likely to follow in the next few weeks.
Fidler tweeted: “Very excited to have signed for Moseley, a club going in the right direction. Cannot wait to get up and get started.
“Thank you Albion and supporters for the season. I hope the club rebuilds and bounces back.”
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