  Because of the unique physical properties and potential applications, the
exploration of quantum materials with diverse symmetry-protected topological
states has attracted considerable interest in the condensed-matter community in
recent years. Most of the topologically nontirvial materials identified thus
far have two-dimensional or three-dimensional structural characteristics, while
the quasi-one-dimensional (quasi-1D) analogs are rare. Here we report on
anisotropic magnetoresistance, Hall effect, and quantum de Haas$-$van Alphen
(dHvA) oscillations in TaPtTe$_5$ single crystals, which possess a layered
crystal structure with quasi-1D PtTe$_2$ chains. TaPtTe$_5$ manifests an
anisotropic magnetoresistance and a nonlinear Hall effect at low temperatures.
The analysis of the dHvA oscillations reveals two major oscillation frequencies
(63.5 T and 95.2 T). The corresponding light effective masses and the nonzero
Berry phases suggest the nontrivial band topology in TaPtTe$_5$, which is
further corroborated by the first-principles calculations. Our results suggest
that TaPtTe$_5$, in analogy with its sister compounds TaPdTe$_5$ and
TaNiTe$_5$, is another quasi-1D material hosting topological Dirac fermions.
