He will play the part of a new uniformed policeman, Nathan, who will arrive in Charnham with his wife, Eve.
It has not yet been confirmed who will be acting alongside him, but DS can reveal that they will both be the 'first in a line of several new castings'.
The actor is set to start filming in August, with early indications pointing to an October screening.
A spokeswoman for the soap told DS: "Nathan and his wife will explode onto our screens in an exciting storyline involving house gazumping."
She added: "They will experience dramas both domestically and professionally."
Jack Ryder played Jamie Mitchell in EastEnders until Christmas 2002 when his character was killed off in a tragic car crash.
His wife, Kym Marsh, recently landed a role in the BBC daytime drama Doctors.
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