On 2014 Dec. 9.61, the All-Sky Automated Survey for SuperNovae (ASAS-SN or Assassin) discovered ASASSN-14lp just $sim2$ days after first light using a global array of 14-cm diameter telescopes. ASASSN-14lp went on to become a bright supernova ($V = 11.94$ mag), second only to SN 2014J for the year. We present prediscovery photometry (with a detection less than a day after first light) and ultraviolet through near-infrared photometric and spectroscopic data covering the rise and fall of ASASSN-14lp for more than 100 days. We find that ASASSN-14lp had a broad light curve ($Delta m_{15}(B) = 0.80 pm 0.05$), a $B$-band maximum at $2457015.82 pm 0.03$, a rise time of $16.94^{+ 0.11 }_{- 0.10 }$ days, and moderate host--galaxy extinction ($E(B-V)_{textrm{host}} = 0.33 pm 0.06$). Using ASASSN-14lp we derive a distance modulus for NGC 4666 of $mu = 30.8 pm 0.2$ corresponding to a distance of $14.7 pm 1.5$ Mpc. However, adding ASASSN-14lp to the calibrating sample of Type Ia supernovae still requires an independent distance to the host galaxy. Finally, using our early-time photometric and spectroscopic observations, we rule out red giant secondaries and, assuming a favorable viewing angle and explosion time, any non-degenerate companion larger than $0.34 R_{textrm{sun}}$.
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