AbstractRare-earth engineering is an effective way to introduce and tune magnetism in topological kagome materials, which have been acting as a fertile platform to investigate the quantum interactions between geometry, topology, spin, and correlation. Here, we report the synthesis, structure, and physical properties of titanium-based kagome metals RETi₃Bi₄ (RE = Yb, Pr, and Nd) with various magnetic states. They all crystallize in the orthogonal space group Fmmm (No. 69), featuring distorted titanium kagome lattices and rare-earth zig-zag chains. By changing the rare earth atoms in the zig-zag chains, the magnetism can be tuned from nonmagnetic YbTi₃Bi₄ to short-range ordered PrTi₃Bi₄ (T_anomaly ~ 8.2 K), and finally to ferromagnetic NdTi₃Bi₄ (T_c ~ 8.5 K). In-situ resistance measurements of NdTi₃Bi₄ under high pressure further reveal a tunable ferromagnetic ordering temperature. These results highlight RETi₃Bi₄ as a promising family of kagome metals to explore nontrivial band topology and exotic phases.