Not all of Tchaikovsky's symphonies were named. They are:
No. 1 in G minor, Op. 13, Winter Daydreams(1866)
No. 2 in C minor, Op. 17, Little Russian (1872)
No. 3 in D major, Op. 29, Polish (1875)
No. 4 in F minor, Op. 36 (1877-1878)
Manfred Symphony, B minor, Op. 58; so named because it was inspired by Byron's poem Manfred (1885)
No. 5 in E minor, Op. 64 (1888)
No. 6 in B minor, Op. 74, Pathétique (1893)
Symphony in E flat (sketched 1892 but unfinished; reworked during the 1950s and later published as Symphony No. 7)