Below are the top 25 programs on cable on Sunday, 3/21/21. Items of note include the premiere of Genius: Aretha on National Geographic, Last Week Tonight on HBO, and The Walking Dead on AMC.
(Note: Click any show with its name in orange to be taken to its page in the TV Ratings Guide Cable Ratings Database.)
| Show | Network | 18-49 Viewers | Viewers (mil.) | 
| NCAA Tournament: OR St. v. OK St. | TBS | 1.1 | 3.59 | 
| NCAA Tournament: Rutgers v. Houston | TBS | 0.85 | 2.79 | 
| NCAA Tournament: TX Tech v. AR | TNT | 0.82 | 2.57 | 
| 90 Day Fiancé | TLC | 0.66 | 2.25 | 
| NCAA Tournament Pre-Game | TNT | 0.61 | 2.06 | 
| The Walking Dead | AMC | 0.56 | 2.11 | 
| NCAA Tournament: No. TX v. Villanova | TNT | 0.51 | 1.69 | 
| NCAA Tournament Pre-Game | TBS | 0.45 | 1.81 | 
| NCAA Tournament Post-Game | TBS | 0.39 | 1.08 | 
| Real Housewives of Atlanta | Bravo | 0.35 | 1.18 | 
| Home Town | HGTV | 0.3 | 2.21 | 
| Tournament of Champions | Food | 0.29 | 1.14 | 
| Sister Wives | TLC | 0.28 | 1.42 | 
| Home Town | HGTV | 0.26 | 1.69 | 
| Married to Medicine | Bravo | 0.25 | 0.84 | 
| Food That Built America | History | 0.23 | 1.07 | 
| Naked and Afraid | Discovery | 0.22 | 1.04 | 
| Genius: Aretha | Nat Geo | 0.21 | 1.38 | 
| College Gameday | ESPN | 0.21 | 0.68 | 
| Momma Named Me Sheriff | Adult Swim | 0.21 | 0.37 | 
| Naked and Afraid | Discovery | 0.2 | 1.04 | 
| Delicious Miss Brown | Food | 0.19 | 0.93 | 
| Genius: Aretha | Nat Geo | 0.19 | 1.37 | 
| When Calls the Heart | Hallmark | 0.19 | 2.21 | 
| Last Week Tonight with John Oliver | HBO | 0.19 | 0.69 | 
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| Highlights Below the Chart: | 
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| Stanley Tucci: Searching for Italy | CNN | 0.15 | 1.40 | 
| Q: Into the Storm | HBO | 0.11 | 0.36 | 
| Shameless | Showtime | 0.1 | 0.48 | 
| Lincoln: Divided We Stand | CNN | 0.09 | 0.98 | 
| Q: Into the Storm | HBO | 0.05 | 0.22 | 
| American Gods | Starz | 0.03 | 0.18 | 
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