Xianxi, Changhua

{{Coord|24.133438|N|120.458881|E|display=title}}

{{Infobox settlement

| official_name = Xianxi Township
線西鄉

| nickname =

| other_name = Siansi; Hsienhsi

| motto =

| settlement_type = Rural township

| image_skyline = 塭仔漁港.jpg

| imagesize = 270px

| image_caption = Fishing port in Xianxi

| image_flag =

| image_seal =

| image_map = SiansiTownship.png

| map_caption = Xianxi Township in Changhua County

| subdivision_type = Location

| subdivision_type1 =

| subdivision_name = Changhua County, Taiwan

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| area_total_km2 = 18

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| population_as_of = January 2023

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| population_total = 16310

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| population_density_km2 = auto

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File:Changhua Coastal Industrial Park - Service center in Hsianhsi area.jpg in Xianxi Township]]

Xianxi Township or Siansi Township ({{zh|c=線西鄉|p=Xiànxi Xiāng}}, Wade-giles: Hsianhsi) is a rural township in Changhua County, Taiwan with 16,310 residents (January 2023). With an area of 18.1 square kilometres, it is the smallest township in the county.