Chopin composed his most popular Nocturne in E-flat major, Op. 9, No. 2 when he was about twenty.
Here is an arrangement for early intermediate classical guitar solo, with tablature, 4 pages with downloadable mp3 for audio help.

The Nocturne No. 20 in c-sharp minor (here in e minor), Op. posth. (lento con gran espressione), P1, No16, KKIVa/16, is a solo piano piece composed by Frederic Chopin in 1830 and published, 26 years after the composer's death, in 1870.

For Guitar solo.

With Guitar tablature. With finger position suggestions. With downloadable mp3 for audio help.

Intermediate to advanced.

Pages: 4 pages, 4' min.

The Nocturne No. 21 op. posth was written by Frédéric Chopin in 1837. It is famous for its striking simplicity and folk-like melody.

For Guitar solo.

With Guitar tablature. With finger position suggestions. With downloadable mp3 for audio help.

Intermediate to advanced.

Pages: 4 pages, 3' min.

The Nocturne Op. 55 No 1 was written by Frederic Chopin in 1842-1844.

For Guitar solo.

With Guitar tablature. With finger position suggestions. With downloadable mp3 for audio help.

Intermediate to advanced.

Pages: 5 pages, 4:45 min.

The Prelude  20 by Frédéric Chopin is commonly known as the Chord Prelude due to its slow progression of quarter note chords.
For Classical Guitar, one page, with tablature and downloadable mp3 for audio help, 1:54' min, easy to early intermediate.