John Glenn Beall, Jr. (b. June 19, 1927) was a Republican member of the United States Senate, representing the State of Maryland from 1971-1977. He was also a member of the Maryland House of Delegates from 1962-1968.

Beall was born in Cumberland, Maryland and graduated from Yale University in 1950. Beall served in the United States Navy from 1945-1946. He went into the insurance business as a member of the general insurance firm of Beall, Garner & Geare, Inc.

In 1962, Beall was elected to the Maryland House of Delegates and was re-elected in 1966. He served as minority floor leader from 1963-1968 until he was elected as a Republican to the Ninety-first Congress.

Beall served one term as a congressman and was elected in 1970 as a Republican to the United States Senate. He failed to be re-elected in 1976, losing to democratic rival Paul Sarbanes. In 1978, Beall ran for Governor of Maryland, but was again unsuccessful, losing to the democratic candidate Harry R. Hughes.

Beall resumed the insurance business in Cumberland, and is currently a resident of Frostburg, Maryland.

|- style="text-align: center;" | width="30%" |Preceded by:
Joseph D. Tydings | width="40%" style="text-align: center;" |Class 1 U.S. Senator from Maryland
1971—1977 | width="30%" |Succeeded by:
Paul Sarbanes