Syllabic verse is a poetic form having a fixed or constrained number of syllables per line, while stress, quantity, or tone play a distinctly secondary role—or no role at all—in the verse structure. It is common in languages that are syllable-timed, such as French or Finnish, as opposed to stress-timed languages such as English, in which accentual verse and accentual-syllabic verse are more common.

Many European languages have significant syllabic verse traditions, notably Italian, Spanish, French, and the Baltic and Slavic languages. These traditions often permeate both folk and literary verse, and have evolved gradually over hundreds or thousands of years. In a sense, the metrical tradition is older than the languages themselves, since it (like the languages) descended from Proto-Indo-European.

It is often implied, incorrectly, that word stress plays no part in the syllabic prosody of these languages. While word stress in most of these languages is much less prominent than in English or German, it is present both in the language and in the meter. Very broadly speaking, syllabic meters in these languages follow the same pattern:

Linguistically, the most significant exceptions to this pattern are in Latvian, Lithuanian, and Serbian verse. These verses retain the older quantitative markers using long and short syllables at the ends of hemistichs, instead of stressed and unstressed.

Due to variations in line length, hemistichs, obligatory stress positions, and other factors among verse traditions, and because each language provides words with different rhythmic characteristics, this basic metrical template is realized with great variety. A sequence of syllables that is metrical in one verse tradition will typically not fit in another.

Humans can perceive the number of members in a small set without actually counting them or mentally breaking them into subsets, with the upper limit of this ability estimated between 5 and 9 units. This seems to hold true in sequences of audible stimuli (e.g. syllables in a line of verse). Therefore, it is no surprise that syllabic hemistichs tend to be very short (typically 4 to 8 syllables), and to be grouped and separated from their neighbors by markers like stress, word boundaries, and rhyme.

Syllabic verse in English is quite distinct from that in most other languages, historically, structurally, and perceptually.

Historically, English syllabics have not evolved over time from native practice, but rather are the inventions of literate poets, primarily in the 20th century. Structurally, syllable counts are not bound by tradition. Even very long lines are not divided into hemistichs, and the verse exhibits none of the markers usually found in other syllabic meters (with the occasional exception of end-rhyme), relying for their measure solely on total count of syllables in the line. Perceptually, "it is very doubtful that verse lines regulated by nothing more than identity of numbers of syllables would be perceived by auditors as verse ... Further, absent the whole notion of meter as pattern, one may question whether syllabic verse is 'metrical' at all." In English, the difficulty of perceiving even brief isosyllabic lines as rhythmically equivalent is aggravated by the inordinate power of stressed syllables.