| Title | Year | Full Date | Production Company | Elmer's Role | Original Work? |
| Beyond the Devil [BTD] | 1937 | c. late 1937, early 1938 | Unknown | Adaptation | No |
| The Bread Basket [BRE] | 1946 | c1946 | Unknown | Author (with E. Blaney Harris, Jr., and Victor Harris) | Yes |
| Canary Cottage [CC] | 1917 | 5 Feb. 1917 | Morosco Theatre, NYC | Author (with Oliver Morosco) | Yes |
| Career Girl [CAR] (aka REV, LEF, 1947) | 1952 | c1952 | Unknown | Author | Yes |
| Carol [CRL] (aka BCC, c1949) | 1953 | c1953 | Unknown | Adaptation | No |
| Celebrities [CEL] | 1934 | c1934 | Unknown | Author | Yes |
| The Devil's Harvest [DH] (aka UTA) | 1943 | c1943 | Unknown | Author (with Harry W. Flannery) | Yes |
| Fillette [FIL] | 1910 | c1910 | Cecil B. DeMille, producer Henry B. Harris | Author (with Cora Older) | Yes |
| Forbidden [FOR] | 1932 | c1932 | Shubert Theatre, NYC | Author | Yes |
| For Sale [FS] | 1912 | c1912 (written), c1924 (prod) | Unknown | Author | Yes |
| The Great Necker [GN] | 1928 | 6 Mar. 1928 | Ambassador Theatre, NYC | Author | Yes |
| Happily Unmarried [HAP] (aka POD) | 1931 | c1931 | Shubert Theatre, NYC | Author | Yes |
| Johnny Belinda [JB] (aka IS, 1934) | 1940 | 18 September 1940 | Belasco Theatre, NYC | Author | Yes |
| La Chienne [LCH] | 1931 | 1931 | Shubert Theatre, NYC | Adaptation | No |
| Ladies All [LA] (aka LAQ) | 1930 | 28 July 1930 | Morosco Theatre, NYC | Adaptation | No |
| Look Pleasant [LOP] | 1918 | Aug. 1918 | Mason Theatre, Los Angeles, CA | Author | No |
| Love and Obey [LOB] (aka BTW, c1944) | 1963 | c1963 | Unknown | Adaptation (with Esther Forbes) | No |
| The Man Who Killed Lincoln [MKL] | 1940 | 17 January 1940 | Longacre Theatre, NYC | Author (with Philip Van Doren Stern) | No |
| Marriage For Three [MFT] (aka DEV and FP) | 1931 | 11 Nov. 1931 | Bijou Theatre, NYC | Author | Yes |
| Midnight for Cinderella [MFC] | 1944 | c1944 | Unknown | Author | Yes |
| A Modern Virgin [MV] | 1931 | 20 May 1931 | Booth Theatre, NYC | Author | Yes |
| Money [MON] | 1918 | c1918 | Unknown | Author | No |
| Napolean Intervenes [NAP] | 1930 | c1930 | Shubert Theatre, NYC | Adaptation | No |
| The Offenders [OFF] | 1908 | 28 September 1908 | Hudson Theatre, NYC | Author | Yes |
| One of Many [OOM] | 1913 | c1913 | Morosco Theatre, NYC | Author | Yes |
| Pappy [PPY] | 1951 | c1951 | Unknown | Author | Yes |
| The Parisienne [PAR] | 1937 | c1937, c1958 | Select Operating Corporation, c1937. Shubert Theatre, c1958 | Author | Yes |
| Peggy [PEG] (aka SWS) | Unknown | c1950 | Unknown | Author | Yes |
| Poor Mama [PM] | 1924 | c1924 | Peninsula Studios | Author | Unknown |
| Pretty Mrs. Smith [PMS] (aka SUS) | 1913 | 22 December 1913 | Casino Theatre, NYC | Author (with Oliver Morosco) | Yes |
| The Romantic Woman [RW] (aka RL) | Unknown | Unknown | Unknown | Translation | No |
| Satan [SAT] | 1914 | c1914 | Unknown | Author | Yes |
| Sham [SHA] (aka FRO) | 1909 | 27 March 1909 | Wallack's Theatre, NYC | Author | Yes |
| Sina [SIN] | 1906 | c1906 | Unknown | Author (with Mary Austin) | Yes |
| Siren [SRN] (aka HEL) | 1931 | c1931 | Shubert Theatre, NYC | Author | Yes |
| So Long, Letty [SLL] (aka TNW) | 1916 | 23 October 1916 | Shubert Theatre, NYC | Author (with Oliver Morosco) | Yes |
| Stepping Out [SO] (aka MER and MWH) | 1929 | 20 May 1929 | Fulton Theatre, NYC | Author | Yes |
| Tempesta [TST] | 1904 | February 1904 | Schaluspielhaus, Hamburg, Germany | Author | Yes |
| Temptation [TEM] | 1929 | c1929 | Shubert Theatre, NYC | Adaptation | No |
| Thy Neighbor's Wife [TNW] (aka SLL) | 1911 | 5 September 1911 | Lyceum Theatre, NYC | Author | Yes |
| Top Man [TPM] | Unknown | Unknown | Unknown | Author | Yes |
| The Trial Marriage [TRI] | 1912 | 29 October 1912 | Hudson Theatre, NYC | Author | Yes |
| Under Treatment [UNT] | 1904 | 1904 | Unknown | Translation and Adaption (with Bertha Pogson) | Yes |
| What Next? [WHN] | 1917 | June 1917 | Majestic Theatre, Los Angeles, CA | Author (with Oliver Morosco) | Yes |
| Young Sinners [YS] (aka FST, WOL, WYE, WOY) | 1929 | 28 November 1929 | Morosco Theatre, NYC | Author | Yes |
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