| 1961 |
La traviata |
Verdi; Anna Moffo, Richard Tucker, Robert Merrill, Rome Opera Orchestra and Chorus, Fernando Previtali |
5
| 10 |
| 1962 |
Aïda |
Verdi; Price, Vickers, Gorr, Merrill, Tozzi, Rome Opera House Orchestra and Chorus, Solti conducting |
| 4 |
| 1965 |
Americana |
Robert Merrill |
| 2 |
| 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 |
| 1986 |
La bohème |
Puccini; Victoria de los Ángeles, Jussi Björling, Amara, Merrill, Reardon, Tozzi, RCA Victor Chorus & Orchestra, Sir Thomas Beecham |
| 7 |
| 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 |
| 1 |
| 1987 |
La bohème |
Giacomo Puccini; Anna Moffo, Richard Tucker, Mary Costa, Robert Merrill, Giorgio Tozzi, Philip Maero, Rome Opera Orchestra and Chorus, Erich Leinsdorf |
5
| 3 |
| 1987 |
Rigoletto |
Giuseppe Verdi; Robert Merrill, Anna Moffo, Alfredo Kraus, Rosalind Elias, Ezio Flagello, Orchestra della RCA Italiana and Chorus, Sir Georg Solti |
| 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 |
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 |
| 3 |
| 1996 |
I Pagliacci |
Leoncavallo; James McCracken, Robert Merrill, Orchestra of the Academy Santa Cecilia, Chorus of the Academy Santa Cecilia, Lamberto Gardelli |
| 1 |
| 1999 |
Lucia di Lammermoor |
Gaetano Donizetti; Joan Sutherland, Renato Cioni, Robert Merrill, Cesare Siepi, Orchestra and Chorus of L’Academia di Santa Cecilia, John Pritchard |
| 2 |
| 2004 |
Dinah Shore Sings … Songs from Aaron Slick From Punkin Crick a.k.a. Marshmallow Moon |
Dinah Shore with Alan Young & Robert Merrill |
| 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 |
| — |
Manon Lescaut |
Giacomo Puccini; Licia Albanese, Jussi Björling, Robert Merrill, Rome Opera Orchestra, Rome Opera Chorus, Jonel Perlea |
| 1 |