Ferro/piezoelectric　transparent　materials　with　both　excellent　piezoelectricity　and　transparency　are　of　great　interest　for　irreplaceable　applications　in　numerous　fields　such　as　photoacoustic　imaging　and　transparent　robots.　Nevertheless,　developing　a　lead-free　ferroelectric　ceramic　that　meets　both　distinct　transparency　and　high　piezoelectricity　has　always　been　challenging.　Herein,　the　simple　single　Sm3+　doped　KNN　ferroelectric　ceramics　(xSm)　are　designed　to　improve　transparency　and　achieve　reasonable　piezoelectricity.　The　results　indicate　that　although　the　donor　doping　effect　of　Sm3+　significantly　improves　the　transparency　by　mainly　causing　grain　refinement　and　densification　improvement,　it　also　enhances　the　relaxor　behavior　of　KNN　ceramics　and　weakens　the　piezoelectricity.　Despite　this,　with　proper　Sm　doping,　reasonable　piezoelectricity　can　still　be　achieved　in　the　xSm　transparent　ceramics　without　causing　a　significant　decrease　in　Curie　temperature.　Ultimately,　excellent　comprehensive　performance　was　achieved　in　the　1.0　Sm　ceramic　(T~65%　at　900　nm,　TC~395　°C,　d33~65　pC/N),　competitively　in　the　KNN-based　transparent　ceramics.　In　force　sensitivity　testing,　the　1.0　Sm　ceramic　also　exhibits　prominent　force　response　electrical　output　characteristics,　which　is　expected　to　be　applied　in　smart　windows　that　require　real-time　pressure　detection.　This　work　furnishes　a　methodology　for　the　fabrication　of　KNN-based　transparent　piezoceramics,　while　contemporaneously　recommending　innovative　perspectives　for　broadening　their　range　of　applications.　©　The　Author(s)　2025.