| Election Name: | 1970 United States Senate election in Maryland |
| Country: | Maryland |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1964 United States Senate election in Maryland |
| Previous Year: | 1964 |
| Next Election: | 1976 United States Senate election in Maryland |
| Next Year: | 1976 |
| Election Date: | November 3, 1970 |
| Image1: | Jglennbealljr (cropped).jpg |
| Nominee1: | J. Glenn Beall Jr. |
| Party1: | Republican Party (US) |
| Popular Vote1: | 484,960 |
| Percentage1: | 50.71% |
| Party2: | Democratic Party (US) |
| Popular Vote2: | 460,422 |
| Percentage2: | 48.14% |
| Map Size: | 275px |
| U.S. Senator | |
| Before Party: | Democratic Party (US) |
| After Party: | Republican Party (US) |
The 1970 United States Senate election in Maryland took place on November 3, 1970. Incumbent Democratic U.S. Senator Joseph Tydings ran for re-election to a second term, but was narrowly defeated by Republican U.S. Representative J. Glenn Beall Jr.
Tydings had defeated Beall's father, Senator James Glenn Beall six years earlier. Tydings's own adoptive father Millard had served as senator as well as Beall Sr., making this a rare dynastic election between the sons of former senators.
, this was the last time a Republican won the Class 1 Senate seat in Maryland.
| J. Glenn BeallRepublican | Joseph TydingsDemocratic | Harvey WilderAmerican | Margin | TotalVotes Cast | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % | % | % | % | ||||||||||
| Allegany | 16432 | 64.96% | 8425 | 33.31% | 437 | 1.73% | 8007 | 31.66% | 25294 | ||||
| Anne Arundel | 39649 | 60.54% | 24986 | 38.15% | 857 | 1.31% | 14663 | 22.39% | 65492 | ||||
| Baltimore | 101631 | 57.17% | 74479 | 41.89% | 1668 | 0.94% | 27152 | 15.27% | 177778 | ||||
| Baltimore City | 66552 | 33.47% | 128392 | 64.58% | 3876 | 1.95% | -61840 | -31.10% | 198820 | ||||
| Calvert | 2854 | 56.68% | 2141 | 42.52% | 40 | 0.79% | 713 | 14.16% | 5035 | ||||
| Caroline | 3034 | 70.79% | 1227 | 28.63% | 25 | 0.58% | 1807 | 42.16% | 4286 | ||||
| Carroll | 12015 | 75.18% | 3804 | 23.80% | 163 | 1.02% | 8211 | 51.38% | 15982 | ||||
| Cecil | 7527 | 63.67% | 4184 | 35.39% | 111 | 0.94% | 3343 | 28.28% | 11822 | ||||
| Charles | 5828 | 58.50% | 4062 | 40.77% | 73 | 0.73% | 1766 | 17.73% | 9963 | ||||
| Dorchester | 5119 | 69.81% | 2108 | 28.75% | 106 | 1.45% | 3011 | 41.06% | 7333 | ||||
| Frederick | 14746 | 65.85% | 7375 | 32.93% | 272 | 1.21% | 7371 | 32.92% | 22393 | ||||
| Garrett | 4701 | 78.93% | 1182 | 19.85% | 73 | 1.23% | 3519 | 59.08% | 5956 | ||||
| Harford | 15405 | 60.27% | 9940 | 38.89% | 213 | 0.83% | 5465 | 21.38% | 25558 | ||||
| Howard | 10097 | 61.95% | 6061 | 37.19% | 141 | 0.87% | 4036 | 24.76% | 16299 | ||||
| Kent | 3502 | 65.37% | 1818 | 33.94% | 37 | 0.69% | 1684 | 31.44% | 5357 | ||||
| Montgomery | 68020 | 43.08% | 88952 | 56.33% | 933 | 0.59% | -20932 | -13.26% | 157905 | ||||
| Prince George's | 59385 | 46.01% | 68356 | 52.96% | 1327 | 1.03% | -8971 | -6.95% | 129068 | ||||
| Queen Anne's | 3073 | 63.30% | 1753 | 36.11% | 29 | 0.60% | 1320 | 27.19% | 4855 | ||||
| St. Mary's | 4298 | 54.38% | 3555 | 44.98% | 50 | 0.63% | 743 | 9.40% | 7903 | ||||
| Somerset | 3995 | 68.37% | 1805 | 30.89% | 43 | 0.74% | 2190 | 37.48% | 5843 | ||||
| Talbot | 4852 | 69.05% | 2143 | 30.50% | 32 | 0.46% | 2709 | 38.55% | 7027 | ||||
| Washington | 19088 | 67.85% | 8611 | 30.61% | 435 | 1.55% | 10477 | 37.24% | 28134 | ||||
| Wicomico | 9305 | 69.99% | 3883 | 29.21% | 106 | 0.80% | 5422 | 40.79% | 13294 | ||||
| Worcester | 3852 | 75.93% | 1180 | 23.26% | 41 | 0.81% | 2672 | 52.67% | 5073 | ||||
| Total | 484960 | 50.70% | 460422 | 48.14% | 11088 | 1.16% | 24538 | 2.57% | 956470 | ||||