苗栗河谷平原,是位于台湾苗栗县中西部,介于头屋丘陵与苗栗丘陵间的后龙溪两岸河谷平原。其范围大致包括公馆乡西部、铜锣乡北部东侧、苗栗市东大半部,以及后龙镇部分地区。
后龙溪穿越坚硬的八角栋山脉后,进入丘陵地带,地层较为软弱,[1]河蚀作用转为侧蚀,形成广阔之河谷平原。[2]
苗栗河谷平原两侧有许多河阶地,皆属古后龙溪河床的一部分,后因地层隆起及河川下蚀,形成今日地貌。[3]
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