The gradual phase-out of stratospheric ozone-depleting substances (ODS), including chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs), has led to the widespread adoption of hydrofluorocarbons (HFCs). HFC-23 (CHF<sub>3</sub>) ranks third among HFCs in radiative forcing contribution. As a potent greenhouse gas, it falls under the Kyoto Protocol and Kigali Amendment, motivating careful monitoring. HFC-23 is not intentionally manufactured; its atmospheric release stems primarily from HCFC-22 production. This study presents the multi-decadal trend of HFC-23 derived from a newly developed retrieval methodology applied to high-resolution solar absorption spectra recorded by ground-based Fourier Transform InfraRed (FTIR) instruments. Measurements obtained at the Jungfraujoch high-altitude research station (Switzerland) within the Network for the Detection of Atmospheric Composition Change (NDACC) were combined across three successive FTIR instruments to produce a continuous and consistent time series from 1986 to 2024, including the earliest detected occurrence of HFC-23 at the site. The FTIR time series was compared with two independent observation datasets, surface <em>in situ</em> measurements from the Advanced Global Atmospheric Gases Experiment (AGAGE) network at Jungfraujoch and satellite retrievals from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS, L2 v5.3), as well as simulations from the TOMCAT global three-dimensional chemical transport model. The resulting annual relative trends (2008–2023) are 3.52 ± 0.37 %.yr<sup>−1</sup> (FTIR), 3.52 ± 0.15 %.yr<sup>−1</sup> (AGAGE), 3.66 ± 0.22 %.yr<sup>−1 </sup>(ACE-FTS) and 3.53 ± 0.11 %.yr<sup>−1</sup> (model). The consistency among datasets supports our retrieval strategy. This methodology can be applied at additional NDACC sites, enabling broader spatial coverage for monitoring this compound using ground-based FTIR instrumentation.