Canlyniadau etholiadau ar gyfer De Brychdyn

 Llafur Cymru Ennill Derek Butler was wedi'i ethol with a majority of 2%. Cafodd cyfanswm o 1738 o bleidleisiau eu bwrw, representing a turnout of 31% .

Table of main parties and election candidates retaining deposit

Ymgeisydd etholiad	Plaid	Nifer	%	Statws	% Newid
Derek Butler	Llafur Cymru	451	26%	Newly elected	n/a
Mike Lowe	Llafur Cymru	417	24%	Newly elected	n/a
Chrissy Gee	Independent / Annibynnol	379	22%	Heb ei ethol	n/a
Donna Louise Lalek	Welsh Liberal Democrats / Democratiaid Rhyddfrydol Cymru	291	17%	Heb ei ethol	n/a
Klaus Armstrong-Braun	Independent / Annibynnol	200	12%	Heb ei ethol	n/a