Bert Henry Miller (born December 15, 1876) was a Democratic politician who represented the state of Idaho in the United States Senate. Serving as a senator in 1949, he held federal office during a single term that began on January 3, 1949, and concluded on December 31, 1949. His tenure in the Senate marked his role as a historical member of Congress from Idaho.

Miller’s service in the Senate was confined to that one term, and he is recorded as a former officeholder with no additional federal positions or committee assignments listed in the available record. Identified by the bioguide ID M000716, his brief period in office places him among the mid-20th-century Democratic senators representing Idaho.