| | built | | end | | ship | | fleet |
| 18901 | | 1918 | | 1939
| | Harmattan (2) | | J. & C. Harrison, London 1888-1979 | details |
| 18902 | | 1930 | | 1971
| | Harmattan (3) | | J. & C. Harrison, London 1888-1979 | details |
| 18903 | | 1959 | | 1972
| | Harmattan (4) | | J. & C. Harrison, London 1888-1979 | details |
| 18904 | | 1898 | | 1933
| | Harmonic (1) | | J. & C. Harrison, London 1888-1979 | details |
| 18905 | | 1905 | | 1940
| | Harmonic (2) | | J. & C. Harrison, London 1888-1979 | details |
| 18906 | | 1930 | | 1943
| | Harmonic (3) | | J. & C. Harrison, London 1888-1979 | details |
| 18907 | | 1898 | | 1942
| | Harmony (1) | | J. & C. Harrison, London 1888-1979 | details |
| 18908 | | 1905 | | 1937
| | Harmony (2) | | J. & C. Harrison, London 1888-1979 | details |
| 18909 | | 1935 | | 1942
| | Harpagon (1) | | J. & C. Harrison, London 1888-1979 | details |
| 18910 | | 1944 | | 1967
| | Harpagon (2) | | J. & C. Harrison, London 1888-1979 | details |
| 18911 | | 1910 | | 1917
| | Harpagus (1) | | J. & C. Harrison, London 1888-1979 | details |
| 18912 | | 1917 | | 1941
| | Harpagus (2) | | J. & C. Harrison, London 1888-1979 | details |
| 18913 | | 1930 | | 1943
| | Harpagus (3) | | J. & C. Harrison, London 1888-1979 | details |
| 18914 | | 1940 | | 1941
| | Harpagus (4) | | J. & C. Harrison, London 1888-1979 | details |
| 18915 | | 1942 | | 1960
| | Harpagus (5) | | J. & C. Harrison, London 1888-1979 | details |
| 18916 | | 1958 | | 1982
| | Harpagus (6) | | J. & C. Harrison, London 1888-1979 | details |
| 18917 | | 1910 | | 1915
| | Harpalion (1) | | J. & C. Harrison, London 1888-1979 | details |
| 18918 | | 1917 | | 1941
| | Harpalion (2) | | J. & C. Harrison, London 1888-1979 | details |
| 18919 | | 1932 | | 1942
| | Harpalion (3) | | J. & C. Harrison, London 1888-1979 | details |
| 18920 | | 1947 | | 1979
| | Harpalion (4) | | J. & C. Harrison, London 1888-1979 | details |
| 18921 | | 1895 | | 1916
| | Harpalus | | J. & C. Harrison, London 1888-1979 | details |
| 18922 | | 1911 | | 1915
| | Harpalyce (1) | | J. & C. Harrison, London 1888-1979 | details |
| 18923 | | 1917 | | 1941
| | Harpalyce (2) | | J. & C. Harrison, London 1888-1979 | details |
| 18924 | | 1930 | | 1960
| | Harpalyce (3) | | J. & C. Harrison, London 1888-1979 | details |
| 18925 | | 1940 | | 1940
| | Harpalyce (4) | | J. & C. Harrison, London 1888-1979 | details |
| 18926 | | 1942 | | 1966
| | Harpalyce (5) | | J. & C. Harrison, London 1888-1979 | details |
| 18927 | | 1958 | | 1983
| | Harpalyce (6) | | J. & C. Harrison, London 1888-1979 | details |
| 18928 | | 1935 | | 1966
| | Harpalycus (1) | | J. & C. Harrison, London 1888-1979 | details |
| 18929 | | 1959 | | 1982
| | Harpalycus (2) | | J. & C. Harrison, London 1888-1979 | details |
| 18930 | | 1934 | | 1942
| | Harpasa | | J. & C. Harrison, London 1888-1979 | details |
| 18931 | | 1913 | | 1918
| | Harpathian (1) | | J. & C. Harrison, London 1888-1979 | details |
| 18932 | | 1930 | | 1941
| | Harpathian (2) | | J. & C. Harrison, London 1888-1979 | details |
| 18933 | | 1944 | | 1971
| | Harpathian (3) | | J. & C. Harrison, London 1888-1979 | details |
| 18934 | | 1909 | | 1917
| | Harpeake | | J. & C. Harrison, London 1888-1979 | details |
| 18935 | | 1897 | | 1916
| | Harpenden (1) | | J. & C. Harrison, London 1888-1979 | details |
| 18936 | | 1906 | | 1917
| | Harpenden (2) | | J. & C. Harrison, London 1888-1979 | details |
| 18937 | | 1930 | | 1963
| | Harpenden (3) | | J. & C. Harrison, London 1888-1979 | details |
| 18938 | | 1898 | | 1927
| | Harperley (1) | | J. & C. Harrison, London 1888-1979 | details |
| 18939 | | 1906 | | 1934
| | Harperley (2) | | J. & C. Harrison, London 1888-1979 | details |
| 18940 | | 1930 | | 1943
| | Harperley (3) | | J. & C. Harrison, London 1888-1979 | details |
| 18941 | | 1943 | | 1959
| | Harperley (4) | | J. & C. Harrison, London 1888-1979 | details |
| 18942 | | 1898 | | 1908
| | Harport (1) | | J. & C. Harrison, London 1888-1979 | details |
| 18943 | | 1907 | | 1942
| | Harport (2) | | J. & C. Harrison, London 1888-1979 | details |
| 18944 | | 1898 | | 1948
| | Harrington | | J. & C. Harrison, London 1888-1979 | details |
| 18945 | | 1907 | | 1952
| | Hartington (1) | | J. & C. Harrison, London 1888-1979 | details |
| 18946 | | 1932 | | 1942
| | Hartington (2) | | J. & C. Harrison, London 1888-1979 | details |
| 18947 | | 1945 | | 1966
| | Hartington (3) | | J. & C. Harrison, London 1888-1979 | details |
| 18948 | | 1933 | | 1942
| | Hartismere (1) | | J. & C. Harrison, London 1888-1979 | details |
| 18949 | | 1947 | | 1973
| | Hartismere (2) | | J. & C. Harrison, London 1888-1979 | details |
| 18950 | | 1934 | | 1942
| | Hartlebury | | J. & C. Harrison, London 1888-1979 | details |