The present work demonstrates the determination of thorium (Th⁴⁺), zinc (Zn²⁺) and fluoride (F⁻) ions by employing a substituted tripodal terpyridine (TP) as a fluorescence sensor. The distinct fluorescence intensities of the free TP and TP‐M complexes (M=Zn²⁺or Th⁴⁺) with the same emission wavelength at 468 nm were observed in steady‐state photoluminescence (PL) spectra at pH 7.0 with a 1 : 3 ratio of metal to the ligand. A ratiometric dual fluorescence signals for Zn²⁺ and Th⁴⁺ were displayed by the probe TP at varied concentrations. Furthermore, the quantitative determination of F⁻ ions was achieved through the addition of F⁻ to the tripod‐terpyridine‐zinc complex (TP‐Zn²⁺) where the fluorescence intensity decreases gradually. Notably, the present work facilitates the LOD (limit of detection) as 1.1×10⁻¹⁰ M, 1.01×10⁻⁸ M and 3.18×10⁻¹⁰ M and further LOQ (limit of quantification) as 0.37×10⁻⁹ M, 0.33×10⁻⁷ M and 5.26×10⁻⁹ M for Zn²⁺, Th⁴⁺ and F⁻ ions, respectively. The predicted absorption spectra of TP show HOMO to LUMO+2 electronic excitation at 358 nm whereas the complex TP‐Th⁴⁺ exhibits HOMO to LUMO+1 electronic excitation at 568 nm.