Trdobojci (; ) is a settlement in the Haloze Hills in the Municipality of Videm in eastern Slovenia. The area is part of the traditional region of Styria. It is now included in the Drava Statistical Region. It includes the hamlets of Spodnji Trdobojci () and Zgornji Trdobojci ().
Trdobojci was attested in written sources in 1440 as Terdowoycz. It is believed to be a plural demonym (via *TvÃÂrdobëd-j-ÃÂci) based on the Slavic personal name *TvÃÂrdobëdÃÂ, a clipped form of the older *TvÃÂrdobëd-je (selo) 'TvÃÂrdobëdÃÂ's village'. The first element of the compound name, tvÃÂrd, means 'hard', and the second, bëdÃÂ, is an imperative of the verb biti; the name TvÃÂrdobëdàthus meant 'be hard'.
Notable people that were born or lived in Trdobojci include: