  We compute the four-loop corrections to the Higgs-bottom vertex within
massless QCD and present analytic results for all color structures. The
infrared poles of the renormalized form factor agree with the predicted
four-loop pattern. Furthermore, we use the results for the Higgs-bottom,
photon-quark, and Higgs-gluon form factors to provide hard matching
coefficients in soft-collinear effective theory up to four-loop accuracy.
