| 1956 | La bohème | Puccini; Victoria de los Ángeles, Jussi Björling, Amara, Merrill, Reardon, Tozzi, RCA Victor Chorus & Orchestra, Sir Thomas Beecham | 10 |
| 1961 | La traviata | Verdi; Anna Moffo, Richard Tucker, Robert Merrill, Rome Opera Orchestra and Chorus, Fernando Previtali | 12 |
| 1962 | Aïda | Verdi; Price, Vickers, Gorr, Merrill, Tozzi, Rome Opera House Orchestra and Chorus, Solti conducting | 7 |
| 1964 | Rigoletto | Giuseppe Verdi; Robert Merrill, Anna Moffo, Alfredo Kraus, Rosalind Elias, Ezio Flagello, Coro e Orchestra della RCA Italiana, Sir Georg Solti | 5 |
| 1965 | Americana | Robert Merrill with Stanley Black conducting the London Festival Orchestra & Chorus | 3 |
| 1967 | Un ballo in maschera | Verdi; Leontyne Price, Carlo Bergonzi, Shirley Verrett, Robert Merrill, Reri Grist, Ezio Flagello, RCA Italiana Opera Orchestra and Chorus, Erich Leinsdorf | 2 |
| 1987 | Cavalleria rusticana | Pietro Mascagni; Zinka Milanov, Jussi Bjoerling, Robert Merrill, Robert Shaw Chorale, RCA Victor Orchestra, Renato Cellini | 1 |
| 1987 | Il barbiere di Siviglia | Gioachino Rossini; Robert Merrill, Roberta Peters, Metropolitan Opera Chorus and Orchestra, Erich Leinsdorf | 3 |
| 1987 | La bohème | Giacomo Puccini; Anna Moffo, Richard Tucker, Mary Costa, Robert Merrill, Giorgio Tozzi, Philip Maero, Rome Opera Orchestra and Chorus, Erich Leinsdorf | 4 |
| 1988 | Carmen | Bizet; Risë Stevens, Jan Peerce, Licia Albanese, Robert Merrill, RCA Victor Orchestra, Robert Shaw Chorale, Fritz Reiner | 2 |
| 1988 | La forza del destino | Giuseppe Verdi; Leontyne Price, Richard Tucker, Robert Merrill, Shirley Verrett, Giorgio Tozzi, Ezio Flagello, RCA Italiana Opera Orchestra and Chorus, Thomas Schippers | 2 |
| 1989 | Falstaff | Giuseppe Verdi; Geraint Evans, Mirella Freni, Giulietta Simionato, Robert Merrill, RCA Italiana Opera Orchestra & Chorus, Sir Georg Solti | 1 |
| 1989 | La traviata | Verdi; Sutherland, Bergonzi, Merrill, Orchestra e coro del Maggio Musicale Fiorentino, Sir John Pritchard | 5 |
| 1989 | Lucia di Lammermoor | Gaetano Donizetti; Joan Sutherland, Renato Cioni, Robert Merrill, Cesare Siepi, Orchestra and Chorus of L’Academia di Santa Cecilia, John Pritchard | 3 |
| 1989 | Pagliacci | Ruggero Leoncavallo; Victoria de los Ángeles, Jussi Björling, Leonard Warren, Robert Merrill, RCA Victor Orchestra, Renato Cellini | 3 |
| 1990 | Carmen | Georges Bizet; Leontyne Price, Franco Corelli, Robert Merrill, Mirella Freni, Wiener Philharmoniker, Herbert von Karajan | 8 |
| 1990 | Carmen (Highlights) | Bizet; Leontyne Price, Franco Corelli, Robert Merrill, Mirella Freni, Vienna Philharmonic, Vienna State Opera Chorus, Herbert von Karajan | 1 |
| 1990 | Il trovatore | Verdi; Franco Corelli, Gabriella Tucci, Giulietta Simionato, Robert Merrill, Chorus and Orchestra of the Teatro dell'Opera di Roma, Thomas Schippers | 1 |
| 1991 | La Gioconda | Ponchielli; Tebaldi, Bergonzi, Merrill, Horne, Orchestra e coro dell’Accademia di Santa Cecilia, Roma, Lamberto Gardelli | 1 |
| 1996 | Pagliacci | Leoncavallo; James McCracken, Robert Merrill, Orchestra of the Academy Santa Cecilia, Chorus of the Academy Santa Cecilia, Lamberto Gardelli | 1 |
| 1997 | La traviata | Giuseppe Verdi; Licia Albanese, Jan Peerce, Robert Merrill, NBC Symphony Orchestra, Arturo Toscanini | 1 |
| 2001 | Rigoletto: Brani scelti | Giuseppe Verdi; Anna Moffo, Robert Merrill, Alfredo Kraus, Rosalind Elias, Ezio Flagello, Orchestra e Coro della RCA Italiana, Sir Georg Solti | 1 |
| 2004 | Dinah Shore Sings … Songs from Aaron Slick From Punkin Crick a.k.a. Marshmallow Moon | Dinah Shore with Alan Young & Robert Merrill | 1 |
| 2014 | Suor Angelica | Giacomo Puccini; Renata Tebaldi, Mario Del Monaco, Robert Merrill, Giulietta Simionato, Fernando Corena, Orchestra e Coro del Maggio Musicale Fiorentino, Lamberto Gardelli | 1 |
| — | Faust | Charles‐François Gounod; Jan Peerce, Cesare Siepi, Victoria de los Ángeles, Robert Merrill, Metropolitan Opera Orchestra, Metropolitan Opera Chorus, Pierre Monteux | 1 |
| — | Il tabarro | Giacomo Puccini; Robert Merrill, Mario del Monaco, Renata Tebaldi, Orchestra del Maggio Musicale Fiorentino, Coro del Maggio Musicale Fiorentino, Lamberto Gardelli | 1 |
| — | La Bohème | Sir Thomas Beecham, Jussi Björling, Victoria de los Ángeles & Robert Merrill | 1 |
| — | Manon Lescaut | Giacomo Puccini; Licia Albanese, Jussi Björling, Robert Merrill, Rome Opera Orchestra, Rome Opera Chorus, Jonel Perlea | 1 |
