Donna, s'i' t'ò fallito is a polyphonic work by the fourteenth-century Italian composer Francesco Landini (c. 1325-1397). It is an example of the Italian dance-form known as the ballata, and is written in two polyphonic parts, a tenor and cantus. It is set in the Italian manner, with the same text in both parts, rather than the French, where only the cantus has a text. The text-setting combined with the more archaic two-voice polyphony, leads scholars to date this work as tentatively belonging to Landini's earlier period of composition. Donna, s'i' t'ò fallito is catalogued as No. 1.

In the thirteenth century, the ballata was closely linked with a genre known as the lauda. This association continued into the fourteenth century, as is observable by the numerous lauda-contrafacta, such as the one between Donna, s'i' t'ò fallito and the lauda Donna s'i partito.

Donna s'i' t'o fallito O d'altr'amor che'l tuo seguir consento Son di morir per le tuo man contento

Ma s'io ti porto et ò portato fede E sempre'l tuo volere Seguito più ch'el mio come tu say

Perch'a diletto ognor mi fai dolere Vegendo tuo merçede Mancar nel viso bel che tolto m'ay

Vuo' tu perch'io t'amai E tanto t'amo c'altro ben non sento Tener la vita mia in tal tormento

Donna s'i' t'o fallito O d'altr'amor che'l tuo seguir consento Son di morir per le tuo man contento

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