Dingguang Temple was formerly the Dipamkara Buddhist Nunnery. It was built in 1761 and renovated in 1848 by disciples led by Chang Lien-Hsi after the Changhua Earthquake. After the renovation, the nunnery was renamed as Dingguang Temple. Then the front hall was demolished due to the widening of the road in front of it during the Japanese-Occupied Period. This Temple does not have a striking facade, magnificent front gate, or majestic mountains. It is a quiet and solemn temple in a secluded world of its own nestling in the corner of the city center in front of the railway station (No. 140 Guangfu Road). People fold their hands to pray as they pass by the temple on the way to their daily activities. It is the earliest and the most visited temple in Changhua City.
彰化定光佛廟又名定光庵，主祀定光古佛。全台灣只有彰化及淡水鄞山寺二處，故為稀少性之古寺，主要為福建汀州籍移民所崇信，為一「人群廟」，故又稱汀州會館。定光佛本為宋代高僧，他曾因伏虎及除蛟之患，為汀州人民所敬仰，後於福建武平巖前城建寺供奉之。
定光佛廟初建於清乾隆二十六年 (西元一七六一年)，址在彰化城內西北角，由永定縣士民，九路總兵張世英等倡建，道光十年，貢生呂彰定等捐修，道光二十八年，因受地震災害，張連喜等鳩資修葺；然而至日據時期因面前道路拓寬，被拆去前殿。
廟原來格局屬兩殿兩廊帶護室式，正殿內尚有乾隆二十七年「西來花雨」 、乾隆三十八年「濟汀渡海」、乾隆三十六年「瀛嶼光天」、乾隆四十一年「光被四表」、嘉慶十八年「曇光普照」及道光五年「智通無礙」古匾，值得一賞。
定光佛廟並不是外表很惹人注意的一座寺廟，既沒有雄偉壯觀的門，也沒有深山古廟的肅穆寧靜，它在彰化火車站前主要道路（光復路140號）鬧區的一隅，自成天地，路人行過廟前，常駐足雙手合十參拜，是彰化市歷史最早與香火鼎盛的寺廟之一。
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