San Leonino

{{Infobox frazione

| name = San Leonino

| native_name =

| image_skyline = Sanleoninoinconio.jpg

| image_caption = The church of San Leonino in Conio

| coordinates = {{coord|43|25|12|N|11|17|50|E|display=inline,title|type:city}}

| region = {{flag|Tuscany}}

| province = Siena (SI)

| comune = Castellina in Chianti

| elevation_footnotes =

| elevation_m = 368

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| population_footnotes =

| population_total = 26

| population_as_of = 2011

| pop_density_footnotes =

| gentilic =

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}}

San Leonino is a village in Tuscany, central Italy, administratively a frazione of the comune of Castellina in Chianti, province of Siena. At the time of the 2001 census its population was 11.{{in lang|it}} [http://dawinci.istat.it/MD/dawinciMD.jsp?a1=m0GG0c0I0&a2=mG0Y8048f8&n=1UH90007SN5&v=1UH07B07SM50000 Popolazione residente - Siena (dettaglio loc. abitate) - Censimento 2001], Istat.

San Leonino is about 19 km from Siena and 7 km from Castellina in Chianti.