We report the generation of shaped tunable ultrashort ultraviolet pulses with full control over the spectral phase and amplitude. The output of a noncollinearly phase-matched optical parametric amplifier is shaped in phase and amplitude by a liquid-crystal spatial light modulator. The resulting structured visible pulses are transferred into the ultraviolet by sum-frequency mixing with strongly chirped 775 nm pulses. Single, double, and triple pulses at 344 nm with subpulses as short as 19 fs are explicitly demonstrated. The method can easily be adapted to arbitrarily shaped pulses throughout the 295-370 nm range.